tldr/pages/common/!.md

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# Exclamation mark
> Bash builtin to substitute with a command found in history.
> More information: <https://gnu.org/software/bash/manual/bash.html#Event-Designators>.
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- Substitute with the previous command and run it with `sudo`:
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`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 a string:
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`!{{string}}`
- Substitute with the arguments of the latest command:
`{{command}} !*`
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- Substitute with the last argument of the latest command:
`{{command}} !$`