tldr/pages/common/entr.md

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# entr
> Run arbitrary commands when files change.
> More information: <http://eradman.com/entrproject/>.
- 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}} /_`
- [c]lear the screen and run a query after the SQL script is updated:
`{{echo my.sql}} | entr -cp {{psql -f}} /_`
- Rebuild the project if source files change, limiting output to the first few lines:
`{{find src/}} | entr -s {{'make | sed 10q'}}`
- Launch and auto-[r]eload a Node.js server:
`{{ls *.js}} | entr -r {{node app.js}}`