entr

Run arbitrary commands when files change.

• Rebuild with `make` if any file in any subdirectory changes:

{ag -l} | entr {make}

• Rebuild and test with `make` if any `.c` source files in the current directory change:

{ls *.c} | entr {'make && make test'}

• Send a `SIGTERM` to any previously spawned ruby subprocesses before executing `ruby main.rb`:

{ls *.rb} | entr -r {ruby main.rb}

• Run a command with the changed file (`/_`) as an argument:

{ls *.sql} | entr {psql -f} /_

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