This determines the name/type of shell that the Perl program is running in (i.e. csh, ksh, bash, tsh, etc.).
I ended up writing this because I needed to write to different files based upon the type of shell that the user is running.
#!/usr/bin/perl -w 
use strict;
my $ppid = getppid();
my $shell = `/usr/bin/ps -p $ppid`;
$shell = (split(/\s+/, $shell))[$#_];
print qq(The parent pid is $ppid\n); 
print qq(The name of the parent shell is $shell\n);

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In reply to What shell am I running? by Rich36

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