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entr

Run arbitrary commands when files change. More information: https://manned.org/entr.

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}} /_