For a nice, portable and generic version of the "do something when the filesystem changes" flavour of tool, check out the "watchmedo" command provided by watchd

For a nice, portable and generic version of the "do something when the filesystem changes" flavour of tool, check out the "watchmedo" command provided by watchdog (https://pypi.python.org/pypi/watchdog https://pypi.python.org/pypi/watchdog). It's quite similar to watchr in ruby-land, but the executable is easier to use without creating a config file.