• alias l="ls -al" → define alias
• unalias l → remove alias

Persistent Alias Config

• User-specific: ~/.bashrc

• Global: /etc/bashrc

  • Add: alias l="ls -al" at end of file
  • Save file

Command History

• Location: ~/.bash_history
• View: history
• Recall specific: !4 → run whoami (4th command in history)