fswatchで変更されたファイルを監視する

$ brew install fswatch
==> Downloading https://homebrew.bintray.com/bottles/fswatch-1.14.0.mojave.bottle.tar.gz
==> Downloading from https://akamai.bintray.com/73/7310f4dbbbdeed582cb713b3d08bf982553747cbda75eb76d2dfe00f309ed3f7?__gda__=exp=1562475460~hmac=da777c8652420e61c6f1f52c5e0feeecf670eee82f4764b442f02a937b69ee3e&response-content-disposition=attachment%3Bfilename%3D%22fswa
######################################################################## 100.0%
==> Pouring fswatch-1.14.0.mojave.bottle.tar.gz
?  /usr/local/Cellar/fswatch/1.14.0: 51 files, 1.2MB

fswatch /path/to/dir

$ fswatch  /path/to/dir/ | xargs -n1 echo &
$ echo "hello!" >> /path/to/dit/test.txt
/path/to/dit/test.txt

$ fswatch  /path/to/dir/ | xargs -n1 cat &
$ echo "hello!" >> /path/to/dit/test.txt
hello!