Question

Good day! Now put this task: Need to write a script that will check to see whether apache2, mysql and php and next to each item write installed or not installed.

The code please do not write! A better chew how. Yours!

Answer 1

You can use which command and test the return value:

which mysql &> /dev/null || echo "mysql is not installed"

You can use type in a similar with increased portability as kojiro suggests:

type mysql &> /dev/null || echo "mysql is not installed"