You can already do this with `write` which is in most linux distro's. Make sure `mesg` is set to y then test with `echo "hello" | write <username>`. `Wall` me

You can already do this with `write` which is in most linux distro's. Make sure `mesg` is set to y then test with `echo "hello" | write <username>`. `Wall` messages all logged in users and I wouldn't recommend that approach.