Mix v1.8.1 mix cmd View Source
Executes the given command.
Useful in umbrella applications to execute a command on each child app:
mix cmd echo pwd
You can limit which apps the cmd runs in by passing the app names before the cmd using --app:
mix cmd --app app1 --app app2 echo pwd
Aborts when a command exits with a non-zero status.
This task is automatically reenabled, so it can be called multiple times with different arguments.
Beware that the Erlang VM does not terminate child processes
when it shuts down. Therefore, if you use
mix cmd to start
long running processes and then shut down the VM, it is likely
that those child processes won't be terminated with the VM.
A solution is to make sure the child processes listen to the
standard input and terminate when standard input is closed.
We discuss this topic at length in the "Zombie OS processes"
Port module documentation.