Not in exactly the same way, but every unixy system has some way of finding the parent pid and looking up its command line.

Is Quanticles's code portable to the other unix systems?

It should work on most systems that have a /proc filesystem: http://en.wikipedia.org/wiki/Procfs

If you don't have /proc but do have ps (1), you could get the parent pid like this:

    PID := $(ps -p $$$$ -o ppid=)