tldr/pages/common/watchexec.md

# watchexec

> Run arbitrary commands when files change.
> More information: <https://manned.org/watchexec>.

- Call `ls -la` when any file in the current directory changes:

`watchexec {{ls -la}}`

- Run `make` when any JavaScript, CSS and HTML file in the current directory changes:

`watchexec {{[-e|--exts]}} {{js,css,html}} make`

- Run `make` when any file in the `lib` or `src` directory changes:

`watchexec {{[-w|--watch]}} {{lib}} {{[-w|--watch]}} {{src}} {{make}}`

- Call/restart `my_server` when any file in the current directory changes, sending `SIGKILL` to stop the child process:

`watchexec {{[-r|--restart]}} --stop-signal {{SIGKILL}} {{my_server}}`

- Restart the execution of a command when any Java source file in the current directory changes, sending `SIGKILL` and only checking for updates every `n`ms:

`watchexec {{[-r|--restart]}} --stop-signal {{SIGKILL}} --poll {{10000}} {{[-e|--exts]}} {{java}} {{command}}`