A utility for running arbitrary commands when files change. Uses kqueue(2) or inotify(7) to avoid polling. entr was written to make rapid feedback and automated testing natural and completely ordinary.

./configure
make test
make install

To see available build options run ./configure -h

wget http://entrproject.org/patches/entr-3.9-wsl
patch -p1 < entr-3.9-wsl
./configure
make install

The source patch is the current workaround for deformed inotify support on WSL.

Rebuild a project if source files change, limiting output to the first 20 lines:

$ find src/ | entr sh -c 'make | head -n 20'

Launch and auto-reload a node.js server:

$ ls *.js | entr -r node app.js

Launch and auto-reload a node.js server as a background task:

$ (ls *.js | entr -r node app.js &)

Clear the screen and run a query after the SQL script is updated:

$ echo my.sql | entr -p psql -f /_

Rebuild project if a source file is modified or added to the src/ directory:

$ while true; do ls src/*.rb | entr -d make; done

A release history as well as features in the upcoming release are covered in the NEWS file.

Source is under and ISC-style license. See the LICENSE file for more detailed information on the license used for compatibility libraries.