[PLUG] What is my current shell?

[TuskenTower <tuskentower@gmail.com>]

All,
We have an oddball problem.  Is there any portable way to determine
what shell you are using once you are inside a script?

Right now, we are thinking of using
which `echo $0`

As you can see here, $SHELL does not change when you switch shells.
[2:07pm] [shaha:pts/8] [shaha] : /gtc/staff/shaha/work/sortT > echo $SHELL
/usr/local/bin/tcsh
[2:08pm] [shaha:pts/8] [shaha] : /gtc/staff/shaha/work/sortT > bash
shaha@shaha:~/work/sortT$  echo $SHELL
/usr/local/bin/tcsh

This is for problems at customer sites where they are using the wrong
Bourne shell on Solaris (/bin/sh) when we want them to use
/usr/xpg4/bin/sh.

thanks,
Amul
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