Run arbitrary commands when files change.
# To call 'ls -la' when any file in the current directory changes:
watchexec <ls -la>
# To run 'make' when any JavaScript, CSS and HTML file in the current directory changes:
watchexec --exts <js,css,html> make
# To run 'make' when any file in the 'lib' or 'src' directory changes:
watchexec --watch <lib> --watch <src> <make>
# To 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>