How do I run a script every time I save a file in Linux?

Question

How do I run a script every time I save a file in Linux?

Answer 1

Linux has a subsystem call inotify which can cause filesystems to report changes in the filesystem to applications.

Your linux system probably has a package called incron which makes using inotify very easy. (Or search your available packages for any package whose description contains the word 'inotify').

Setting up incron is very much like setting up cron, except whereas cron executes a script at a specified time and date, incron executes a script whenever a specified file or directory changes.

PS. On Ubuntu (for example), incron is this package and is installed with

sudo apt-get install incron