tldr/pages/common/!.md

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# Exclamation mark
> Bash builtin to substitute with a command found in history.
> More information: <https://www.gnu.org/software/bash/manual/bash.html#Event-Designators>.
- Substitute with the previous command and run it with sudo:
`sudo !!`
- Substitute with a command based on its line number found with `history`:
`!{{number}}`
- Substitute with a command that was used a specified number of lines back:
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`!-{{number}}`
- Substitute with the most recent command that starts with `string`:
`!{{string}}`