I've got one I haven't been able to figure out.

1. A shell script exists- /junk/junk1/junk2/junk3.sh
2. From within the above named shell script, I want to know the full path of the above named shell script. Even if I execute the shell script from a directory other than the one it resides in, I want to know the directory where the script resides, not the path where the script was executed from.

For example:

I'm in: /home/myhome
and I put the following on the command line: /junk/junk1/junk2/junk3.sh
I want the following stored to a variable inside the script: /junk/junk1/junk2
I don't want the following stored to a variable inside the script: /home/myhome

How do I figure this out?

TIA
Paul