# watchexec > Run arbitrary commands when files change. > More information: . - 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 --exts {{js,css,html}} make` - Run `make` when any file in the `lib` or `src` directory changes: `watchexec --watch {{lib}} --watch {{src}} {{make}}` - Call/restart `my_server` when any file in the current directory changes, sending `SIGKILL` to stop the child process: `watchexec --restart --stop-signal {{SIGKILL}} {{my_server}}`