Fast File Watcher

Run specific tasks when specific files are added, changed or deleted

Install by doing:

go get -u github.com/raphamorim/wat

Then simply run:

wat <path> <command>

Example using date command:

wat src/ date

Returns for every file update inside src folder:

Waiting...
Sat Oct 29 15:34:23 BRST 2016

wat vs grunt-contrib-watch

This is because of your system's max opened file limit. For OSX the default is very low (256). Temporarily increase your limit with ulimit -n 10480, the number being the new max limit.

In some versions of OSX the above solution doesn't work. In that case try launchctl limit maxfiles 10480 10480 and restart your terminal. See here.