Run a command when a file is accessed

Waits for changes to one or more files.
More information: <https://manned.org/inotifywait>.
Trick copyright: tl;dr; <https://github.com/tldr-pages/tldr>

inotifywait --event {{access}} {{path/to/file}} && {{command}}

click the source code to copy install inotifywait on any operating system with command-not-found.com