Add note about entr

notebook/Linux/Tools/entr.md

@@ -0,0 +1,22 @@
+---
+tags: automation
+---
+# entr
+Runs a command when files change:
+
+```sh
+find -type f -name '*.c' | entr make
+```
+
+Use `-s` to interpret the first argument as a shell command:
+
+```sh
+find -type f | entr -s "clear && ls"
+```
+
+## Services
+Use `-r` to monitor and automatically restart services:
+
+```sh
+find -name "*.lua" | entr -r lua server.lua
+```