tldr/pages/linux/entr.md

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# entr
> Run arbitrary commands when files change.
- Rebuild with `make` if any files in any subfolders change:
`{{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}} /_`