inotifywait
Waits for changes to one or more files.
TLDR
Run a command when a file changes
$ while inotifywait [path/to/file]; do [command]; done
Be quiet about watching for changes
$ while inotifywait --quiet [path/to/file]; do [command]; done
Watch a directory recursively for changes
$ while inotifywait --recursive [path/to/directory]; do [command]; done
Exclude files matching a regular expression
$ while inotifywait --recursive [path/to/directory] --exlude '[regular_expression]'; do [command]; done
Wait at most 30 seconds
$ while inotifywait --timeout [30] [path/to/file]; do [command]; done
Only watch for file modification events
$ while inotifywait --event [modify] [path/to/file]; do [command]; done
