entr

Run arbitrary commands when files change. More information: https://eradman.com/entrproject/.

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

{{ag --files-with-matches}} | 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}}