Question

I have a script that I copyed in
/usr/bin/ups

In this script I print usage with this:

if [ ! $# == 1 ]; then
   echo "Usage: $0 {start|stop|restart|status}"
   exit
fi

when I run command “ups” I get this:

Usage: /usr/bin/ups {start|stop|restart|status}

How can I print usage like this:

Usage: ups {start|stop|restart|status}

The easyest way will be to do this:

if [ ! $# == 1 ]; then
   echo "Usage: ups {start|stop|restart|status}"
   exit
fi

but if some day I change the name of this file the usage text will be the same as before (ups).

Is there a nice way to do this?

Answer 1

Use basename:

echo "Usage: $(basename $0) {start|stop|restart|status}"