2-node-supercomputer.net 2023-03-15


Sometimes you want to wait on a file change, and then do something.

For example, you modify a source code file, and whenever you save, you want to compile.

inotifywait from the inotify-tools package to the rescue!

However, it only outputs that something changed, so pipe the output to clear the terminal and call make:

inotifywait -m -e close_write *.ly *.ily |
while read line; do clear; make; done

The -m option says to keep monitoring, -e close_write monitors for programs closing a file that had been opened for writing, and *.ly *.ily are the file patterns to monitor.

There is also fsnotifywait and fsnotifywatch and inotifywatch. One day I will find out the difference.