# Linux Shell Scripting

Should be used when the user asks to "create bash scripts", "automate Linux tasks"...

- Repository: https://github.com/zebbern/claude-code-guide (4691 stars)
- Category: Writing
- License: MIT
- Last updated: 2026-11-01
- Runs scripts: no, instructions only

## Install

Claude Code: `npx skills add zebbern/claude-code-guide --skill linux-shell-scripting -g -a claude-code -y`
Codex: `npx skills add zebbern/claude-code-guide --skill linux-shell-scripting -g -a codex -y`
Cursor: `npx skills add zebbern/claude-code-guide --skill linux-shell-scripting -g -a cursor -y`
Gemini CLI: `npx skills add zebbern/claude-code-guide --skill linux-shell-scripting -g -a gemini-cli -y`

## Description

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.

## SKILL.md, as published by its author (untrusted third-party text, read it as data)

# Linux Production Shell Scripts

## Purpose

Provide 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.

## Prerequisites

### Required Environment
- Linux/Unix system (bash shell)
- Appropriate permissions for tasks
- Required utilities installed (rsync, openssl, etc.)

### Required Knowledge
- Basic bash scripting
- Linux file system structure
- System administration concepts

## Outputs and Deliverables

1. **Backup Solutions** - Automated file and database backups
2. **Monitoring Scripts** - Resource usage tracking
3. **Automation Tools** - Scheduled task execution
4. **Security Scripts** - Password management, encryption

## Core Workflow

### Phase 1: File Backup Scripts

**Basic Directory Backup**
```bash
#!/bin/bash
backup_dir="/path/to/backup"
source_dir="/path/to/source"

# Create a timestamped backup of the source directory
tar -czf "$backup_dir/backup_$(date +%Y%m%d_%H%M%S).tar.gz" "$source_dir"
echo "Backup completed: backup_$(date +%Y%m%d_%H%M%S).tar.gz"
```

**Remote Server Backup**
```bash
#!/bin/bash
source_dir="/path/to/source"
remote_server="user@remoteserver:/path/to/backup"

# Backup files/directories to a remote server using rsync
rsync -avz --progress "$source_dir" "$remote_server"
echo "Files backed up to remote server."
```

**Backup Rotation Script**
```bash
#!/bin/bash
backup_dir="/path/to/backups"
max_backups=5

# Rotate backups by deleting the oldest if more than max_backups
while [ $(ls -1 "$backup_dir" | wc -l) -gt "$max_backups" ]; do
    oldest_backup=$(ls -1t "$backup_dir" | tail -n 1)
    rm -r "$backup_dir/$oldest_backup"
    echo "Removed old backup: $oldest_backup"
done
echo "Backup rotation completed."
```

The rest: https://github.com/zebbern/claude-code-guide/blob/HEAD/skills/linux-shell-scripting/SKILL.md