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It provides ready-to-use shell script templates for system administration.","davila7\u002Fclaude-code-templates","davila7","https:\u002F\u002Favatars.githubusercontent.com\u002Fu\u002F6216945?v=4","01M6ADEWWFPS191NFM0Y1EX1JH","Daniel Avila","01M6ADJHGM78PHQRD3XZTFDVKK",33481,"MIT","https:\u002F\u002Fgithub.com\u002Fdavila7\u002Fclaude-code-templates\u002Fblob\u002Fmain\u002Fcli-tool\u002Fcomponents\u002Fskills\u002Fdevelopment\u002Flinux-shell-scripting\u002FSKILL.md",[18],{"categoryNo":19,"categoryName":20,"taxonomyType":21,"taxonomyTypeDesc":22},"01JBSEEDCAT000000000000023","Skill与智能体开发","SCENARIO","使用场景",[24,25,5,26,27,28,29,30,31,32,33,34,35,36,37,38,39,40,41,42,43],"Production","scripts","shell","shell scripts","linux","system","when","for","resources","manage","files","ready","use","write","automate","Bash","templates","create","tasks","monitor","2026-11-10 10:12:30",false,"---\nname: Linux Production Shell Scripts\ndescription: This skill should be used when the user asks to \"create bash scripts\", \"automate Linux tasks\", \"monitor system resources\", \"backup files\", \"manage users\", or \"write production shell scripts\". It provides ready-to-use shell script templates for system administration.\nmetadata:\n  author: zebbern\n  version: \"1.1\"\n---\n\n# Linux Production Shell Scripts\n\n## Purpose\n\nProvide production-ready shell script templates for common Linux system administration tasks including backups, monitoring, user management, log analysis, and automation. These scripts serve as building blocks for security operations and penetration testing environments.\n\n## Prerequisites\n\n### Required Environment\n- Linux\u002FUnix system (bash shell)\n- Appropriate permissions for tasks\n- Required utilities installed (rsync, openssl, etc.)\n\n### Required Knowledge\n- Basic bash scripting\n- Linux file system structure\n- System administration concepts\n\n## Outputs and Deliverables\n\n1. **Backup Solutions** - Automated file and database backups\n2. **Monitoring Scripts** - Resource usage tracking\n3. **Automation Tools** - Scheduled task execution\n4. **Security Scripts** - Password management, encryption\n\n## Core Workflow\n\n### Phase 1: File Backup Scripts\n\n**Basic Directory Backup**\n```bash\n#!\u002Fbin\u002Fbash\nbackup_dir=\"\u002Fpath\u002Fto\u002Fbackup\"\nsource_dir=\"\u002Fpath\u002Fto\u002Fsource\"\n\n# Create a timestamped backup of the source directory\ntar -czf \"$backup_dir\u002Fbackup_$(date +%Y%m%d_%H%M%S).tar.gz\" \"$source_dir\"\necho \"Backup completed: backup_$(date +%Y%m%d_%H%M%S).tar.gz\"\n```\n\n**Remote Server Backup**\n```bash\n#!\u002Fbin\u002Fbash\nsource_dir=\"\u002Fpath\u002Fto\u002Fsource\"\nremote_server=\"user@remoteserver:\u002Fpath\u002Fto\u002Fbackup\"\n\n# Backup files\u002Fdirectories to a remote server using rsync\nrsync -avz --progress \"$source_dir\" \"$remote_server\"\necho \"Files backed up to remote server.\"\n```\n\n**Backup Rotation Script**\n```bash\n#!\u002Fbin\u002Fbash\nbackup_dir=\"\u002Fpath\u002Fto\u002Fbackups\"\nmax_backups=5\n\n# Rotate backups by deleting the oldest if more than max_backups\nwhile [ $(ls -1 \"$backup_dir\" | wc -l) -gt \"$max_backups\" ]; do\n    oldest_backup=$(ls -1t \"$backup_dir\" | tail -n 1)\n    rm -r \"$backup_dir\u002F$oldest_backup\"\n    echo \"Removed old backup: $oldest_backup\"\ndone\necho \"Backup rotation completed.\"\n```\n\n**Database Backup Script**\n```bash\n#!\u002Fbin\u002Fbash\ndatabase_name=\"your_database\"\ndb_user=\"username\"\ndb_pass=\"password\"\noutput_file=\"database_backup_$(date +%Y%m%d).sql\"\n\n# Perform database backup using mysqldump\nmysqldump -u \"$db_user\" -p\"$db_pass\" \"$database_name\" > \"$output_file\"\ngzip \"$output_file\"\necho \"Database backup created: $output_file.gz\"\n```\n\n### Phase 2: System Monitoring Scripts\n\n**CPU Usage Monitor**\n```bash\n#!\u002Fbin\u002Fbash\nthreshold=90\n\n# Monitor CPU usage and trigger alert if threshold exceeded\ncpu_usage=$(top -bn1 | grep \"Cpu(s)\" | awk '{print $2}' | cut -d. -f1)\n\nif [ \"$cpu_usage\" -gt \"$threshold\" ]; then\n    echo \"ALERT: High CPU usage detected: $cpu_usage%\"\n    # Add notification logic (email, slack, etc.)\n    # mail -s \"CPU Alert\" admin@example.com \u003C\u003C\u003C \"CPU usage: $cpu_usage%\"\nfi\n```\n\n**Disk Space Monitor**\n```bash\n#!\u002Fbin\u002Fbash\nthreshold=90\npartition=\"\u002Fdev\u002Fsda1\"\n\n# Monitor disk usage and trigger alert if threshold exceeded\ndisk_usage=$(df -h | grep \"$partition\" | awk '{print $5}' | cut -d% -f1)\n\nif [ \"$disk_usage\" -gt \"$threshold\" ]; then\n    echo \"ALERT: High disk usage detected: $disk_usage%\"\n    # Add alert\u002Fnotification logic here\nfi\n```\n\n**CPU Usage Logger**\n```bash\n#!\u002Fbin\u002Fbash\noutput_file=\"cpu_usage_log.txt\"\n\n# Log current CPU usage to a file with timestamp\ntimestamp=$(date '+%Y-%m-%d %H:%M:%S')\ncpu_usage=$(top -bn1 | grep 'Cpu(s)' | awk '{print $2}' | cut -d. -f1)\necho \"$timestamp - CPU Usage: $cpu_usage%\" >> \"$output_file\"\necho \"CPU usage logged.\"\n```\n\n**System Health Check**\n```bash\n#!\u002Fbin\u002Fbash\noutput_file=\"system_health_check.txt\"\n\n# Perform system health check and save results to a file\n{\n    echo \"System Health Check - $(date)\"\n    echo \"================================\"\n    echo \"\"\n    echo \"Uptime:\"\n    uptime\n    echo \"\"\n    echo \"Load Average:\"\n    cat \u002Fproc\u002Floadavg\n    echo \"\"\n    echo \"Memory Usage:\"\n    free -h\n    echo \"\"\n    echo \"Disk Usage:\"\n    df -h\n    echo \"\"\n    echo \"Top Processes:\"\n    ps aux --sort=-%cpu | head -10\n} > \"$output_file\"\n\necho \"System health check saved to $output_file\"\n```\n\n### Phase 3: User Management Scripts\n\n**User Account Creation**\n```bash\n#!\u002Fbin\u002Fbash\nusername=\"newuser\"\n\n# Check if user exists; if not, create new user\nif id \"$username\" &>\u002Fdev\u002Fnull; then\n    echo \"User $username already exists.\"\nelse\n    useradd -m -s \u002Fbin\u002Fbash \"$username\"\n    echo \"User $username created.\"\n    \n    # Set password interactively\n    passwd \"$username\"\nfi\n```\n\n**Password Expiry Checker**\n```bash\n#!\u002Fbin\u002Fbash\noutput_file=\"password_expiry_report.txt\"\n\n# Check password expiry for users with bash shell\necho \"Password Expiry Report - $(date)\" > \"$output_file\"\necho \"=================================\" >> \"$output_file\"\n\nIFS=$'\\n'\nfor user in $(grep \"\u002Fbin\u002Fbash\" \u002Fetc\u002Fpasswd | cut -d: -f1); do\n    password_expires=$(chage -l \"$user\" 2>\u002Fdev\u002Fnull | grep \"Password expires\" | awk -F: '{print $2}')\n    echo \"User: $user - Password Expires: $password_expires\" >> \"$output_file\"\ndone\nunset IFS\n\necho \"Password expiry report saved to $output_file\"\n```\n\n### Phase 4: Security Scripts\n\n**Password Generator**\n```bash\n#!\u002Fbin\u002Fbash\nlength=${1:-16}\n\n# Generate a random password\npassword=$(openssl rand -base64 48 | tr -dc 'a-zA-Z0-9!@#$%^&*' | head -c\"$length\")\necho \"Generated password: $password\"\n```\n\n**File Encryption Script**\n```bash\n#!\u002Fbin\u002Fbash\nfile=\"$1\"\naction=\"${2:-encrypt}\"\n\nif [ -z \"$file\" ]; then\n    echo \"Usage: $0 \u003Cfile> [encrypt|decrypt]\"\n    exit 1\nfi\n\nif [ \"$action\" == \"encrypt\" ]; then\n    # Encrypt file using AES-256-CBC\n    openssl enc -aes-256-cbc -salt -pbkdf2 -in \"$file\" -out \"$file.enc\"\n    echo \"File encrypted: $file.enc\"\nelif [ \"$action\" == \"decrypt\" ]; then\n    # Decrypt file\n    output_file=\"${file%.enc}\"\n    openssl enc -aes-256-cbc -d -pbkdf2 -in \"$file\" -out \"$output_file\"\n    echo \"File decrypted: $output_file\"\nfi\n```\n\n### Phase 5: Log Analysis Scripts\n\n**Error Log Extractor**\n```bash\n#!\u002Fbin\u002Fbash\nlogfile=\"${1:-\u002Fvar\u002Flog\u002Fsyslog}\"\noutput_file=\"error_log_$(date +%Y%m%d).txt\"\n\n# Extract lines with \"ERROR\" from the log file\ngrep -i \"error\\|fail\\|critical\" \"$logfile\" > \"$output_file\"\necho \"Error log created: $output_file\"\necho \"Total errors found: $(wc -l \u003C \"$output_file\")\"\n```\n\n**Web Server Log Analyzer**\n```bash\n#!\u002Fbin\u002Fbash\nlog_file=\"${1:-\u002Fvar\u002Flog\u002Fapache2\u002Faccess.log}\"\n\necho \"Web Server Log Analysis\"\necho \"========================\"\necho \"\"\necho \"Top 10 IP Addresses:\"\nawk '{print $1}' \"$log_file\" | sort | uniq -c | sort -rn | head -10\necho \"\"\necho \"Top 10 Requested URLs:\"\nawk '{print $7}' \"$log_file\" | sort | uniq -c | sort -rn | head -10\necho \"\"\necho \"HTTP Status Code Distribution:\"\nawk '{print $9}' \"$log_file\" | sort | uniq -c | sort -rn\n```\n\n### Phase 6: Network Scripts\n\n**Network Connectivity Checker**\n```bash\n#!\u002Fbin\u002Fbash\nhosts=(\"8.8.8.8\" \"1.1.1.1\" \"google.com\")\n\necho \"Network Connectivity Check\"\necho \"==========================\"\n\nfor host in \"${hosts[@]}\"; do\n    if ping -c 1 -W 2 \"$host\" &>\u002Fdev\u002Fnull; then\n        echo \"[UP] $host is reachable\"\n    else\n        echo \"[DOWN] $host is unreachable\"\n    fi\ndone\n```\n\n**Website Uptime Checker**\n```bash\n#!\u002Fbin\u002Fbash\nwebsites=(\"https:\u002F\u002Fgoogle.com\" \"https:\u002F\u002Fgithub.com\")\nlog_file=\"uptime_log.txt\"\n\necho \"Website Uptime Check - $(date)\" >> \"$log_file\"\n\nfor website in \"${websites[@]}\"; do\n    if curl --output \u002Fdev\u002Fnull --silent --head --fail --max-time 10 \"$website\"; then\n        echo \"[UP] $website is accessible\" | tee -a \"$log_file\"\n    else\n        echo \"[DOWN] $website is inaccessible\" | tee -a \"$log_file\"\n    fi\ndone\n```\n\n**Network Interface Info**\n```bash\n#!\u002Fbin\u002Fbash\ninterface=\"${1:-eth0}\"\n\necho \"Network Interface Information: $interface\"\necho \"=========================================\"\nip addr show \"$interface\" 2>\u002Fdev\u002Fnull || ifconfig \"$interface\" 2>\u002Fdev\u002Fnull\necho \"\"\necho \"Routing Table:\"\nip route | grep \"$interface\"\n```\n\n### Phase 7: Automation Scripts\n\n**Automated Package Installation**\n```bash\n#!\u002Fbin\u002Fbash\npackages=(\"vim\" \"htop\" \"curl\" \"wget\" \"git\")\n\necho \"Installing packages...\"\n\nfor package in \"${packages[@]}\"; do\n    if dpkg -l | grep -q \"^ii  $package\"; then\n        echo \"[SKIP] $package is already installed\"\n    else\n        sudo apt-get install -y \"$package\"\n        echo \"[INSTALLED] $package\"\n    fi\ndone\n\necho \"Package installation completed.\"\n```\n\n**Task Scheduler (Cron Setup)**\n```bash\n#!\u002Fbin\u002Fbash\nscheduled_task=\"\u002Fpath\u002Fto\u002Fyour_script.sh\"\nschedule_time=\"0 2 * * *\"  # Run at 2 AM daily\n\n# Add task to crontab\n(crontab -l 2>\u002Fdev\u002Fnull; echo \"$schedule_time $scheduled_task\") | crontab -\necho \"Task scheduled: $schedule_time $scheduled_task\"\n```\n\n**Service Restart Script**\n```bash\n#!\u002Fbin\u002Fbash\nservice_name=\"${1:-apache2}\"\n\n# Restart a specified service\nif systemctl is-active --quiet \"$service_name\"; then\n    echo \"Restarting $service_name...\"\n    sudo systemctl restart \"$service_name\"\n    echo \"Service $service_name restarted.\"\nelse\n    echo \"Service $service_name is not running. Starting...\"\n    sudo systemctl start \"$service_name\"\n    echo \"Service $service_name started.\"\nfi\n```\n\n### Phase 8: File Operations\n\n**Directory Synchronization**\n```bash\n#!\u002Fbin\u002Fbash\nsource_dir=\"\u002Fpath\u002Fto\u002Fsource\"\ndestination_dir=\"\u002Fpath\u002Fto\u002Fdestination\"\n\n# Synchronize directories using rsync\nrsync -avz --delete \"$source_dir\u002F\" \"$destination_dir\u002F\"\necho \"Directories synchronized successfully.\"\n```\n\n**Data Cleanup Script**\n```bash\n#!\u002Fbin\u002Fbash\ndirectory=\"${1:-\u002Ftmp}\"\ndays=\"${2:-7}\"\n\necho \"Cleaning files older than $days days in $directory\"\n\n# Remove files older than specified days\nfind \"$directory\" -type f -mtime +\"$days\" -exec rm -v {} \\;\necho \"Cleanup completed.\"\n```\n\n**Folder Size Checker**\n```bash\n#!\u002Fbin\u002Fbash\nfolder_path=\"${1:-.}\"\n\necho \"Folder Size Analysis: $folder_path\"\necho \"====================================\"\n\n# Display sizes of subdirectories sorted by size\ndu -sh \"$folder_path\"\u002F* 2>\u002Fdev\u002Fnull | sort -rh | head -20\necho \"\"\necho \"Total size:\"\ndu -sh \"$folder_path\"\n```\n\n### Phase 9: System Information\n\n**System Info Collector**\n```bash\n#!\u002Fbin\u002Fbash\noutput_file=\"system_info_$(hostname)_$(date +%Y%m%d).txt\"\n\n{\n    echo \"System Information Report\"\n    echo \"Generated: $(date)\"\n    echo \"=========================\"\n    echo \"\"\n    echo \"Hostname: $(hostname)\"\n    echo \"OS: $(uname -a)\"\n    echo \"\"\n    echo \"CPU Info:\"\n    lscpu | grep -E \"Model name|CPU\\(s\\)|Thread\"\n    echo \"\"\n    echo \"Memory:\"\n    free -h\n    echo \"\"\n    echo \"Disk Space:\"\n    df -h\n    echo \"\"\n    echo \"Network Interfaces:\"\n    ip -br addr\n    echo \"\"\n    echo \"Logged In Users:\"\n    who\n} > \"$output_file\"\n\necho \"System info saved to $output_file\"\n```\n\n### Phase 10: Git and Development\n\n**Git Repository Updater**\n```bash\n#!\u002Fbin\u002Fbash\ngit_repos=(\"\u002Fpath\u002Fto\u002Frepo1\" \"\u002Fpath\u002Fto\u002Frepo2\")\n\nfor repo in \"${git_repos[@]}\"; do\n    if [ -d \"$repo\u002F.git\" ]; then\n        echo \"Updating repository: $repo\"\n        cd \"$repo\"\n        git fetch --all\n        git pull origin \"$(git branch --show-current)\"\n        echo \"Updated: $repo\"\n    else\n        echo \"Not a git repository: $repo\"\n    fi\ndone\n\necho \"All repositories updated.\"\n```\n\n**Remote Script Execution**\n```bash\n#!\u002Fbin\u002Fbash\nremote_server=\"${1:-user@remote-server}\"\nremote_script=\"${2:-\u002Fpath\u002Fto\u002Fremote\u002Fscript.sh}\"\n\n# Execute a script on a remote server via SSH\nssh \"$remote_server\" \"bash -s\" \u003C \"$remote_script\"\necho \"Remote script executed on $remote_server\"\n```\n\n## Quick Reference\n\n### Common Script Patterns\n\n| Pattern | Purpose |\n|---------|---------|\n| `#!\u002Fbin\u002Fbash` | Shebang for bash |\n| `$(date +%Y%m%d)` | Date formatting |\n| `$((expression))` | Arithmetic |\n| `${var:-default}` | Default value |\n| `\"$@\"` | All arguments |\n\n### Useful Commands\n\n| Command | Purpose |\n|---------|---------|\n| `chmod +x script.sh` | Make executable |\n| `.\u002Fscript.sh` | Run script |\n| `nohup .\u002Fscript.sh &` | Run in background |\n| `crontab -e` | Edit cron jobs |\n| `source script.sh` | Run in current shell |\n\n### Cron Format\nMinute(0-59) Hour(0-23) Day(1-31) Month(1-12) Weekday(0-7, 0\u002F7=Sun)\n\n## Constraints and Limitations\n\n- Always test scripts in non-production first\n- Use absolute paths to avoid errors\n- Quote variables to handle spaces properly\n- Many scripts require root\u002Fsudo privileges\n- Use `bash -x script.sh` for debugging\n","# Linux Production Shell Scripts\n\n## Purpose\n\nProvide production-ready shell script templates for common Linux system administration tasks including backups, monitoring, user management, log analysis, and automation. These scripts serve as building blocks for security operations and penetration testing environments.\n\n## Prerequisites\n\n### Required Environment\n- Linux\u002FUnix system (bash shell)\n- Appropriate permissions for tasks\n- Required utilities installed (rsync, openssl, etc.)\n\n### Required Knowledge\n- Basic bash scripting\n- Linux file system structure\n- System administration concepts\n\n## Outputs and Deliverables\n\n1. **Backup Solutions** - Automated file and database backups\n2. **Monitoring Scripts** - Resource usage tracking\n3. **Automation Tools** - Scheduled task execution\n4. **Security Scripts** - Password management, encryption\n\n## Core Workflow\n\n### Phase 1: File Backup Scripts\n\n**Basic Directory Backup**\n```bash\n#!\u002Fbin\u002Fbash\nbackup_dir=\"\u002Fpath\u002Fto\u002Fbackup\"\nsource_dir=\"\u002Fpath\u002Fto\u002Fsource\"\n\n# Create a timestamped backup of the source directory\ntar -czf \"$backup_dir\u002Fbackup_$(date +%Y%m%d_%H%M%S).tar.gz\" \"$source_dir\"\necho \"Backup completed: backup_$(date +%Y%m%d_%H%M%S).tar.gz\"\n```\n\n**Remote Server Backup**\n```bash\n#!\u002Fbin\u002Fbash\nsource_dir=\"\u002Fpath\u002Fto\u002Fsource\"\nremote_server=\"user@remoteserver:\u002Fpath\u002Fto\u002Fbackup\"\n\n# Backup files\u002Fdirectories to a remote server using rsync\nrsync -avz --progress \"$source_dir\" \"$remote_server\"\necho \"Files backed up to remote server.\"\n```\n\n**Backup Rotation Script**\n```bash\n#!\u002Fbin\u002Fbash\nbackup_dir=\"\u002Fpath\u002Fto\u002Fbackups\"\nmax_backups=5\n\n# Rotate backups by deleting the oldest if more than max_backups\nwhile [ $(ls -1 \"$backup_dir\" | wc -l) -gt \"$max_backups\" ]; do\n    oldest_backup=$(ls -1t \"$backup_dir\" | tail -n 1)\n    rm -r \"$backup_dir\u002F$oldest_backup\"\n    echo \"Removed old backup: $oldest_backup\"\ndone\necho \"Backup rotation completed.\"\n```\n\n**Database Backup Script**\n```bash\n#!\u002Fbin\u002Fbash\ndatabase_name=\"your_database\"\ndb_user=\"username\"\ndb_pass=\"password\"\noutput_file=\"database_backup_$(date +%Y%m%d).sql\"\n\n# Perform database backup using mysqldump\nmysqldump -u \"$db_user\" -p\"$db_pass\" \"$database_name\" > \"$output_file\"\ngzip \"$output_file\"\necho \"Database backup created: $output_file.gz\"\n```\n\n### Phase 2: System Monitoring Scripts\n\n**CPU Usage Monitor**\n```bash\n#!\u002Fbin\u002Fbash\nthreshold=90\n\n# Monitor CPU usage and trigger alert if threshold exceeded\ncpu_usage=$(top -bn1 | grep \"Cpu(s)\" | awk '{print $2}' | cut -d. -f1)\n\nif [ \"$cpu_usage\" -gt \"$threshold\" ]; then\n    echo \"ALERT: High CPU usage detected: $cpu_usage%\"\n    # Add notification logic (email, slack, etc.)\n    # mail -s \"CPU Alert\" admin@example.com \u003C\u003C\u003C \"CPU usage: $cpu_usage%\"\nfi\n```\n\n**Disk Space Monitor**\n```bash\n#!\u002Fbin\u002Fbash\nthreshold=90\npartition=\"\u002Fdev\u002Fsda1\"\n\n# Monitor disk usage and trigger alert if threshold exceeded\ndisk_usage=$(df -h | grep \"$partition\" | awk '{print $5}' | cut -d% -f1)\n\nif [ \"$disk_usage\" -gt \"$threshold\" ]; then\n    echo \"ALERT: High disk usage detected: $disk_usage%\"\n    # Add alert\u002Fnotification logic here\nfi\n```\n\n**CPU Usage Logger**\n```bash\n#!\u002Fbin\u002Fbash\noutput_file=\"cpu_usage_log.txt\"\n\n# Log current CPU usage to a file with timestamp\ntimestamp=$(date '+%Y-%m-%d %H:%M:%S')\ncpu_usage=$(top -bn1 | grep 'Cpu(s)' | awk '{print $2}' | cut -d. -f1)\necho \"$timestamp - CPU Usage: $cpu_usage%\" >> \"$output_file\"\necho \"CPU usage logged.\"\n```\n\n**System Health Check**\n```bash\n#!\u002Fbin\u002Fbash\noutput_file=\"system_health_check.txt\"\n\n# Perform system health check and save results to a file\n{\n    echo \"System Health Check - $(date)\"\n    echo \"================================\"\n    echo \"\"\n    echo \"Uptime:\"\n    uptime\n    echo \"\"\n    echo \"Load Average:\"\n    cat \u002Fproc\u002Floadavg\n    echo \"\"\n    echo \"Memory Usage:\"\n    free -h\n    echo \"\"\n    echo \"Disk Usage:\"\n    df -h\n    echo \"\"\n    echo \"Top Processes:\"\n    ps aux --sort=-%cpu | head -10\n} > \"$output_file\"\n\necho \"System health check saved to $output_file\"\n```\n\n### Phase 3: User Management Scripts\n\n**User Account Creation**\n```bash\n#!\u002Fbin\u002Fbash\nusername=\"newuser\"\n\n# Check if user exists; if not, create new user\nif id \"$username\" &>\u002Fdev\u002Fnull; then\n    echo \"User $username already exists.\"\nelse\n    useradd -m -s \u002Fbin\u002Fbash \"$username\"\n    echo \"User $username created.\"\n    \n    # Set password interactively\n    passwd \"$username\"\nfi\n```\n\n**Password Expiry Checker**\n```bash\n#!\u002Fbin\u002Fbash\noutput_file=\"password_expiry_report.txt\"\n\n# Check password expiry for users with bash shell\necho \"Password Expiry Report - $(date)\" > \"$output_file\"\necho \"=================================\" >> \"$output_file\"\n\nIFS=$'\\n'\nfor user in $(grep \"\u002Fbin\u002Fbash\" \u002Fetc\u002Fpasswd | cut -d: -f1); do\n    password_expires=$(chage -l \"$user\" 2>\u002Fdev\u002Fnull | grep \"Password expires\" | awk -F: '{print $2}')\n    echo \"User: $user - Password Expires: $password_expires\" >> \"$output_file\"\ndone\nunset IFS\n\necho \"Password expiry report saved to $output_file\"\n```\n\n### Phase 4: Security Scripts\n\n**Password Generator**\n```bash\n#!\u002Fbin\u002Fbash\nlength=${1:-16}\n\n# Generate a random password\npassword=$(openssl rand -base64 48 | tr -dc 'a-zA-Z0-9!@#$%^&*' | head -c\"$length\")\necho \"Generated password: $password\"\n```\n\n**File Encryption Script**\n```bash\n#!\u002Fbin\u002Fbash\nfile=\"$1\"\naction=\"${2:-encrypt}\"\n\nif [ -z \"$file\" ]; then\n    echo \"Usage: $0 \u003Cfile> [encrypt|decrypt]\"\n    exit 1\nfi\n\nif [ \"$action\" == \"encrypt\" ]; then\n    # Encrypt file using AES-256-CBC\n    openssl enc -aes-256-cbc -salt -pbkdf2 -in \"$file\" -out \"$file.enc\"\n    echo \"File encrypted: $file.enc\"\nelif [ \"$action\" == \"decrypt\" ]; then\n    # Decrypt file\n    output_file=\"${file%.enc}\"\n    openssl enc -aes-256-cbc -d -pbkdf2 -in \"$file\" -out \"$output_file\"\n    echo \"File decrypted: $output_file\"\nfi\n```\n\n### Phase 5: Log Analysis Scripts\n\n**Error Log Extractor**\n```bash\n#!\u002Fbin\u002Fbash\nlogfile=\"${1:-\u002Fvar\u002Flog\u002Fsyslog}\"\noutput_file=\"error_log_$(date +%Y%m%d).txt\"\n\n# Extract lines with \"ERROR\" from the log file\ngrep -i \"error\\|fail\\|critical\" \"$logfile\" > \"$output_file\"\necho \"Error log created: $output_file\"\necho \"Total errors found: $(wc -l \u003C \"$output_file\")\"\n```\n\n**Web Server Log Analyzer**\n```bash\n#!\u002Fbin\u002Fbash\nlog_file=\"${1:-\u002Fvar\u002Flog\u002Fapache2\u002Faccess.log}\"\n\necho \"Web Server Log Analysis\"\necho \"========================\"\necho \"\"\necho \"Top 10 IP Addresses:\"\nawk '{print $1}' \"$log_file\" | sort | uniq -c | sort -rn | head -10\necho \"\"\necho \"Top 10 Requested URLs:\"\nawk '{print $7}' \"$log_file\" | sort | uniq -c | sort -rn | head -10\necho \"\"\necho \"HTTP Status Code Distribution:\"\nawk '{print $9}' \"$log_file\" | sort | uniq -c | sort -rn\n```\n\n### Phase 6: Network Scripts\n\n**Network Connectivity Checker**\n```bash\n#!\u002Fbin\u002Fbash\nhosts=(\"8.8.8.8\" \"1.1.1.1\" \"google.com\")\n\necho \"Network Connectivity Check\"\necho \"==========================\"\n\nfor host in \"${hosts[@]}\"; do\n    if ping -c 1 -W 2 \"$host\" &>\u002Fdev\u002Fnull; then\n        echo \"[UP] $host is reachable\"\n    else\n        echo \"[DOWN] $host is unreachable\"\n    fi\ndone\n```\n\n**Website Uptime Checker**\n```bash\n#!\u002Fbin\u002Fbash\nwebsites=(\"https:\u002F\u002Fgoogle.com\" \"https:\u002F\u002Fgithub.com\")\nlog_file=\"uptime_log.txt\"\n\necho \"Website Uptime Check - $(date)\" >> \"$log_file\"\n\nfor website in \"${websites[@]}\"; do\n    if curl --output \u002Fdev\u002Fnull --silent --head --fail --max-time 10 \"$website\"; then\n        echo \"[UP] $website is accessible\" | tee -a \"$log_file\"\n    else\n        echo \"[DOWN] $website is inaccessible\" | tee -a \"$log_file\"\n    fi\ndone\n```\n\n**Network Interface Info**\n```bash\n#!\u002Fbin\u002Fbash\ninterface=\"${1:-eth0}\"\n\necho \"Network Interface Information: $interface\"\necho \"=========================================\"\nip addr show \"$interface\" 2>\u002Fdev\u002Fnull || ifconfig \"$interface\" 2>\u002Fdev\u002Fnull\necho \"\"\necho \"Routing Table:\"\nip route | grep \"$interface\"\n```\n\n### Phase 7: Automation Scripts\n\n**Automated Package Installation**\n```bash\n#!\u002Fbin\u002Fbash\npackages=(\"vim\" \"htop\" \"curl\" \"wget\" \"git\")\n\necho \"Installing packages...\"\n\nfor package in \"${packages[@]}\"; do\n    if dpkg -l | grep -q \"^ii  $package\"; then\n        echo \"[SKIP] $package is already installed\"\n    else\n        sudo apt-get install -y \"$package\"\n        echo \"[INSTALLED] $package\"\n    fi\ndone\n\necho \"Package installation completed.\"\n```\n\n**Task Scheduler (Cron Setup)**\n```bash\n#!\u002Fbin\u002Fbash\nscheduled_task=\"\u002Fpath\u002Fto\u002Fyour_script.sh\"\nschedule_time=\"0 2 * * *\"  # Run at 2 AM daily\n\n# Add task to crontab\n(crontab -l 2>\u002Fdev\u002Fnull; echo \"$schedule_time $scheduled_task\") | crontab -\necho \"Task scheduled: $schedule_time $scheduled_task\"\n```\n\n**Service Restart Script**\n```bash\n#!\u002Fbin\u002Fbash\nservice_name=\"${1:-apache2}\"\n\n# Restart a specified service\nif systemctl is-active --quiet \"$service_name\"; then\n    echo \"Restarting $service_name...\"\n    sudo systemctl restart \"$service_name\"\n    echo \"Service $service_name restarted.\"\nelse\n    echo \"Service $service_name is not running. Starting...\"\n    sudo systemctl start \"$service_name\"\n    echo \"Service $service_name started.\"\nfi\n```\n\n### Phase 8: File Operations\n\n**Directory Synchronization**\n```bash\n#!\u002Fbin\u002Fbash\nsource_dir=\"\u002Fpath\u002Fto\u002Fsource\"\ndestination_dir=\"\u002Fpath\u002Fto\u002Fdestination\"\n\n# Synchronize directories using rsync\nrsync -avz --delete \"$source_dir\u002F\" \"$destination_dir\u002F\"\necho \"Directories synchronized successfully.\"\n```\n\n**Data Cleanup Script**\n```bash\n#!\u002Fbin\u002Fbash\ndirectory=\"${1:-\u002Ftmp}\"\ndays=\"${2:-7}\"\n\necho \"Cleaning files older than $days days in $directory\"\n\n# Remove files older than specified days\nfind \"$directory\" -type f -mtime +\"$days\" -exec rm -v {} \\;\necho \"Cleanup completed.\"\n```\n\n**Folder Size Checker**\n```bash\n#!\u002Fbin\u002Fbash\nfolder_path=\"${1:-.}\"\n\necho \"Folder Size Analysis: $folder_path\"\necho \"====================================\"\n\n# Display sizes of subdirectories sorted by size\ndu -sh \"$folder_path\"\u002F* 2>\u002Fdev\u002Fnull | sort -rh | head -20\necho \"\"\necho \"Total size:\"\ndu -sh \"$folder_path\"\n```\n\n### Phase 9: System Information\n\n**System Info Collector**\n```bash\n#!\u002Fbin\u002Fbash\noutput_file=\"system_info_$(hostname)_$(date +%Y%m%d).txt\"\n\n{\n    echo \"System Information Report\"\n    echo \"Generated: $(date)\"\n    echo \"=========================\"\n    echo \"\"\n    echo \"Hostname: $(hostname)\"\n    echo \"OS: $(uname -a)\"\n    echo \"\"\n    echo \"CPU Info:\"\n    lscpu | grep -E \"Model name|CPU\\(s\\)|Thread\"\n    echo \"\"\n    echo \"Memory:\"\n    free -h\n    echo \"\"\n    echo \"Disk Space:\"\n    df -h\n    echo \"\"\n    echo \"Network Interfaces:\"\n    ip -br addr\n    echo \"\"\n    echo \"Logged In Users:\"\n    who\n} > \"$output_file\"\n\necho \"System info saved to $output_file\"\n```\n\n### Phase 10: Git and Development\n\n**Git Repository Updater**\n```bash\n#!\u002Fbin\u002Fbash\ngit_repos=(\"\u002Fpath\u002Fto\u002Frepo1\" \"\u002Fpath\u002Fto\u002Frepo2\")\n\nfor repo in \"${git_repos[@]}\"; do\n    if [ -d \"$repo\u002F.git\" ]; then\n        echo \"Updating repository: $repo\"\n        cd \"$repo\"\n        git fetch --all\n        git pull origin \"$(git branch --show-current)\"\n        echo \"Updated: $repo\"\n    else\n        echo \"Not a git repository: $repo\"\n    fi\ndone\n\necho \"All repositories updated.\"\n```\n\n**Remote Script Execution**\n```bash\n#!\u002Fbin\u002Fbash\nremote_server=\"${1:-user@remote-server}\"\nremote_script=\"${2:-\u002Fpath\u002Fto\u002Fremote\u002Fscript.sh}\"\n\n# Execute a script on a remote server via SSH\nssh \"$remote_server\" \"bash -s\" \u003C \"$remote_script\"\necho \"Remote script executed on $remote_server\"\n```\n\n## Quick Reference\n\n### Common Script Patterns\n\n| Pattern | Purpose |\n|---------|---------|\n| `#!\u002Fbin\u002Fbash` | Shebang for bash |\n| `$(date +%Y%m%d)` | Date formatting |\n| `$((expression))` | Arithmetic |\n| `${var:-default}` | Default value |\n| `\"$@\"` | All arguments |\n\n### Useful Commands\n\n| Command | Purpose |\n|---------|---------|\n| `chmod +x script.sh` | Make executable |\n| `.\u002Fscript.sh` | Run script |\n| `nohup .\u002Fscript.sh &` | Run in background |\n| `crontab -e` | Edit cron jobs |\n| `source script.sh` | Run in current shell |\n\n### Cron Format\nMinute(0-59) Hour(0-23) Day(1-31) Month(1-12) Weekday(0-7, 0\u002F7=Sun)\n\n## Constraints and Limitations\n\n- Always test scripts in non-production first\n- Use absolute paths to avoid errors\n- Quote variables to handle spaces properly\n- Many scripts require root\u002Fsudo privileges\n- Use `bash -x script.sh` for debugging\n",{"name":5,"metadata":49,"description":7},{"author":50,"version":51},"zebbern","1.1","main","2b749c82b5d11fac39d9a6e021ce3f5b8a541bd1","cli-tool\u002Fcomponents\u002Fskills\u002Fdevelopment\u002Flinux-shell-scripting",3931,"https:\u002F\u002Fgithub.com\u002Fdavila7\u002Fclaude-code-templates","https:\u002F\u002Faitmpl.com","https:\u002F\u002Fgithub.com\u002Fdavila7","https:\u002F\u002Fdanielavila.me","Building AI dev tools with LLMs","2026-11-14 06:14:46",{"source":8,"skillName":5,"commands":63,"prompt":73,"zipAvailable":74},[64,67,70],{"tool":65,"command":66},"npx","npx skills add davila7\u002Fclaude-code-templates --skill \"Linux Production Shell Scripts\"",{"tool":68,"command":69},"bunx","bunx skills add davila7\u002Fclaude-code-templates --skill \"Linux Production Shell Scripts\"",{"tool":71,"command":72},"pnpm","pnpm dlx skills add davila7\u002Fclaude-code-templates --skill \"Linux Production Shell Scripts\"","安装技能，技能地址：https:\u002F\u002Fgithub.com\u002Fdavila7\u002Fclaude-code-templates\u002Fblob\u002Fmain\u002Fcli-tool\u002Fcomponents\u002Fskills\u002Fdevelopment\u002Flinux-shell-scripting\u002FSKILL.md",true,[],[77,102,129,162,197,221],{"skillNo":78,"name":79,"nameZh":6,"description":80,"descriptionZh":6,"repositoryFullName":8,"ownerLogin":9,"ownerAvatarUrl":10,"ownerAccountNo":11,"ownerDisplayName":12,"repositoryNo":13,"starsCount":14,"licenseSpdxId":15,"licenseFileUrl":6,"sourceHtmlUrl":81,"categories":82,"keywords":84,"publishedAt":44},"01M70NHBTQ8BV0A2SCAZXEPHCX","wealthville-pool-scoring","Score DeFi liquidity pools before providing liquidity. Returns a 0-100 pool score and an Enter\u002FHold\u002FExit\u002FReduce\u002FAvoid verdict with calibrated confidence for ~68,800 Solana pools and 575 EVM pools, plus a public miss-inclusive track record. Use when asked whether a pool is worth LPing into, which pools look best right now, or how accurate the scores have actually been.","https:\u002F\u002Fgithub.com\u002Fdavila7\u002Fclaude-code-templates\u002Fblob\u002Fmain\u002Fcli-tool\u002Fcomponents\u002Fskills\u002Fweb-data\u002Fwealthville-pool-scoring\u002FSKILL.md",[83],{"categoryNo":19,"categoryName":20,"taxonomyType":21,"taxonomyTypeDesc":22},[85,86,87,88,89,31,90,91,36,30,92,93,94,95,96,97,98,99,100,101],"scoring","pool","wealthville pool scoring","liquidity","which","exit","now","reduce","with","record","track","verdict","evm","solana","how","public","look",{"skillNo":103,"name":104,"nameZh":6,"description":105,"descriptionZh":6,"repositoryFullName":8,"ownerLogin":9,"ownerAvatarUrl":10,"ownerAccountNo":11,"ownerDisplayName":12,"repositoryNo":13,"starsCount":14,"licenseSpdxId":15,"licenseFileUrl":6,"sourceHtmlUrl":106,"categories":107,"keywords":109,"publishedAt":44},"01M70MB6VR8ERJ4EM8D5KHBMEV","technical-debt-auditor","Scans a codebase and produces a quantified technical debt report with a prioritized remediation plan. Analyzes dead code, TODO\u002FFIXME\u002FHACK markers, dependency staleness, complexity hotspots, code duplication signals, test coverage gaps, unused exports, and outdated patterns. Use this skill when the user asks to audit their codebase for tech debt, wants a health check of their code quality, says things like \"where should I focus refactoring\", \"find code smells\", \"audit my codebase\", \"what technical debt do we have\", \"prioritize cleanup work\", or asks about code quality metrics. Also trigger when the user mentions \"code rot\", \"legacy cleanup\", \"refactoring priorities\", or wants to understand the overall health of a project before a major effort. Trigger even if the user doesn't say \"technical debt\" explicitly — any request to systematically assess code quality and identify improvement priorities belongs here.","https:\u002F\u002Fgithub.com\u002Fdavila7\u002Fclaude-code-templates\u002Fblob\u002Fmain\u002Fcli-tool\u002Fcomponents\u002Fskills\u002Fdevelopment\u002Ftechnical-debt-auditor\u002FSKILL.md",[108],{"categoryNo":19,"categoryName":20,"taxonomyType":21,"taxonomyTypeDesc":22},[110,111,112,113,114,115,116,117,118,119,120,30,121,122,123,124,125,126,127,128],"technical debt","debt","technical","technical debt auditor","auditor","coverage","complexity","markers","project","cleanup","unused","code","todo","work","plan","focus","signals","audit","dependency",{"skillNo":130,"name":131,"nameZh":6,"description":132,"descriptionZh":6,"repositoryFullName":8,"ownerLogin":9,"ownerAvatarUrl":10,"ownerAccountNo":11,"ownerDisplayName":12,"repositoryNo":13,"starsCount":14,"licenseSpdxId":15,"licenseFileUrl":6,"sourceHtmlUrl":133,"categories":134,"keywords":144,"publishedAt":44},"01M70KPYH9QNHCNME5GJQGE22K","readonly-sql-guard","Make an agent's database access provably read-only. Use when an agent runs caller-supplied SQL against a production\u002FERP\u002Fanalytics database (a \"query\" MCP tool, text-to-SQL, an admin console), or when reviewing DB-access code for write\u002FDDL\u002Fside-effect\u002Ftransaction-escape risks. Checks what a statement CALLS, not just its shape.","https:\u002F\u002Fgithub.com\u002Fdavila7\u002Fclaude-code-templates\u002Fblob\u002Fmain\u002Fcli-tool\u002Fcomponents\u002Fskills\u002Fdatabase\u002Freadonly-sql-guard\u002FSKILL.md",[135,138,139],{"categoryNo":136,"categoryName":137,"taxonomyType":21,"taxonomyTypeDesc":22},"01JBSEEDCAT000000000000010","后端与接口",{"categoryNo":19,"categoryName":20,"taxonomyType":21,"taxonomyTypeDesc":22},{"categoryNo":140,"categoryName":141,"taxonomyType":142,"taxonomyTypeDesc":143},"01JBSEEDCAT000000000000033","数据分析师","PROFESSION","适用职业",[145,146,147,148,149,150,151,31,152,153,154,155,156,157,158,36,159,160,30,161],"readonly","guard","sql guard","sql","readonly sql guard","erp","effect","read-only","db","just","tool","calls","only","MCP","access","database","query",{"skillNo":163,"name":164,"nameZh":6,"description":165,"descriptionZh":6,"repositoryFullName":8,"ownerLogin":9,"ownerAvatarUrl":10,"ownerAccountNo":11,"ownerDisplayName":12,"repositoryNo":13,"starsCount":14,"licenseSpdxId":166,"licenseFileUrl":167,"sourceHtmlUrl":168,"categories":169,"keywords":173,"publishedAt":44},"01M6AFY6F7CC2BBZP1QD6VTNVC","web-artifacts-builder","Suite of tools for creating elaborate, multi-component claude.ai HTML artifacts using modern frontend web technologies (React, Tailwind CSS, shadcn\u002Fui). Use for complex artifacts requiring state management, routing, or shadcn\u002Fui components - not for simple single-file HTML\u002FJSX artifacts.","Apache-2.0","https:\u002F\u002Fgithub.com\u002Fdavila7\u002Fclaude-code-templates\u002Fblob\u002Fmain\u002Fcli-tool\u002Fcomponents\u002Fskills\u002Futilities\u002Fweb-artifacts-builder\u002FLICENSE.txt","https:\u002F\u002Fgithub.com\u002Fdavila7\u002Fclaude-code-templates\u002Fblob\u002Fmain\u002Fcli-tool\u002Fcomponents\u002Fskills\u002Futilities\u002Fweb-artifacts-builder\u002FSKILL.md",[170],{"categoryNo":171,"categoryName":172,"taxonomyType":21,"taxonomyTypeDesc":22},"01JBSEEDCAT000000000000009","前端开发",[174,175,176,177,178,179,180,181,182,183,184,185,186,187,188,189,190,191,192,193,194,195,31,196],"artifacts builder","web","web artifacts builder","artifacts","builder","state","routing","state management","component","css","frontend","ui","Tools","file","components","shadcn","react","Tailwind","suite","jsx","html","single-file","ui components",{"skillNo":198,"name":199,"nameZh":6,"description":200,"descriptionZh":6,"repositoryFullName":8,"ownerLogin":9,"ownerAvatarUrl":10,"ownerAccountNo":11,"ownerDisplayName":12,"repositoryNo":13,"starsCount":14,"licenseSpdxId":166,"licenseFileUrl":201,"sourceHtmlUrl":202,"categories":203,"keywords":208,"publishedAt":44},"01M6AFWF33SFV9Z3SF4PEEE4BF","webapp-testing","Toolkit for interacting with and testing local web applications using Playwright. Supports verifying frontend functionality, debugging UI behavior, capturing browser screenshots, and viewing browser logs.","https:\u002F\u002Fgithub.com\u002Fdavila7\u002Fclaude-code-templates\u002Fblob\u002Fmain\u002Fcli-tool\u002Fcomponents\u002Fskills\u002Fsecurity\u002Fwebapp-testing\u002FLICENSE.txt","https:\u002F\u002Fgithub.com\u002Fdavila7\u002Fclaude-code-templates\u002Fblob\u002Fmain\u002Fcli-tool\u002Fcomponents\u002Fskills\u002Fsecurity\u002Fwebapp-testing\u002FSKILL.md",[204,207],{"categoryNo":205,"categoryName":206,"taxonomyType":21,"taxonomyTypeDesc":22},"01JBSEEDCAT000000000000008","测试与质量",{"categoryNo":171,"categoryName":172,"taxonomyType":21,"taxonomyTypeDesc":22},[209,210,211,212,213,175,214,184,185,215,216,217,218,31,219,93,220],"webapp testing","testing","webapp","browser","playwright","applications","debugging","toolkit","logs","screenshots","local","behavior",{"skillNo":222,"name":223,"nameZh":6,"description":224,"descriptionZh":6,"repositoryFullName":8,"ownerLogin":9,"ownerAvatarUrl":10,"ownerAccountNo":11,"ownerDisplayName":12,"repositoryNo":13,"starsCount":14,"licenseSpdxId":166,"licenseFileUrl":225,"sourceHtmlUrl":226,"categories":227,"keywords":235,"publishedAt":44},"01M6AF67Q67JJJ5V51JR2P52KA","discernment-nudge","After you give a substantive answer or draft that the user may act on — advice or recommendations, drafted artifacts such as goals, plans, pitches, proposals, or emails, estimates or projections, analysis or interpretation of data, factual claims they may rely on, or a multi-step argument — invoke this skill BEFORE finalizing your reply and then, if it applies, append 2-3 short follow-up questions, each tied to something specific in what you just produced, that help the user check key facts, probe the reasoning or assumptions, and notice missing context. Do this at most once per conversation. Skip it when the user asked a trivial how-to or simple lookup, wants a purely educational explanation, asked you only to format, convert, or assemble a file from content they provided, is writing code they will run, is doing creative writing or casual chat, or already asked you to double-check, cite, or review — the skill file explains these boundaries and the exact output format.","https:\u002F\u002Fgithub.com\u002Fdavila7\u002Fclaude-code-templates\u002Fblob\u002Fmain\u002Fcli-tool\u002Fcomponents\u002Fskills\u002Fproductivity\u002Fdiscernment-nudge\u002FLICENSE.txt","https:\u002F\u002Fgithub.com\u002Fdavila7\u002Fclaude-code-templates\u002Fblob\u002Fmain\u002Fcli-tool\u002Fcomponents\u002Fskills\u002Fproductivity\u002Fdiscernment-nudge\u002FSKILL.md",[228,231,232],{"categoryNo":229,"categoryName":230,"taxonomyType":21,"taxonomyTypeDesc":22},"01JBSEEDCAT000000000000018","写作与文案",{"categoryNo":19,"categoryName":20,"taxonomyType":21,"taxonomyTypeDesc":22},{"categoryNo":233,"categoryName":234,"taxonomyType":142,"taxonomyTypeDesc":143},"01JBSEEDCAT000000000000036","内容创作者",[236,237,238,239,240,241,242,243,177,244,187,121,245,246,247,248,249,157,250,30,251,252,253,254,255,99,256],"discernment nudge","nudge","interpretation","help","run","reasoning","data","writing","lookup","content","review","conversation","short","up","invoke","you","analysis","claims","argument","assemble","recommendations"]