tldr/pages/common/!.md

# 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:

`!-{{number}}`

- Substitute with the most recent command that starts with a string:

`!{{string}}`

- Substitute with the arguments of the latest command:

`{{command}} !*`