Definition:
How to read synopsis?
- bold text type exactly as shown.
- italic text replace with appropriate argument.
- [-abc] any or all arguments within [ ] are optional.
- -a|-b options delimited by | cannot be used together.
- argument … argument is repeatable.
- [expression] … entire expression within [ ] is repeatable.
1. Introduction
2. Definitions
3. Basic shell features
5. Shell variables
6. Bash features
..
9. Using History Interactively
- history command
- When the shell starts up, the history is initialized from the file named by the HISTFILE variable (default ~/.bash_history)
- run history to see the command history and
!nb (ex: !2) to execute that command
!! is last command
- ex: forgot to sudo, rerun with
sudo !!