Shell Scripting
Automating tasks through command-line scripts
Shell Scripting involves writing programs for command-line interpreters to automate tasks, manage systems, and perform security operations.
Common Shells
- Bash - Default on most Linux distributions
- Zsh - Extended Bourne shell with improvements
- PowerShell - Windows automation and scripting
- sh - POSIX-compliant Bourne shell
Core Concepts
- Variables and data types
- Control structures (if, for, while)
- Functions and modularity
- Input/output redirection
- Pipes and command chaining
- Regular expressions
Security Applications
- Log analysis and parsing
- Automated security checks
- Incident response automation
- System hardening scripts
- Backup and recovery automation
- Security tool orchestration
Best Practices
- Error handling and logging
- Input validation
- Secure credential handling
- Code comments and documentation
- Version control
- Testing and validation
