The perl's in your $PATH can be shown like this:
bash: type -a perl
perl ist /opt/perl/bin/perl
perl ist /usr/bin/perl
perl ist /usr/bin/X11/perl
Vendor's perl:
bash: /usr/sbin/zypper info perl
...
Information for package perl:
Repository: @System
Name: perl
Version: 5.12.3-11.20.1
Arch: i586
Vendor: openSUSE
Installed: Yes
Status: up-to-date
Installed Size: 40.5 MiB
Summary: The Perl interpreter
Description:
perl - Practical Extraction and Report Language
...
Find all perls that you can access with current privileges:
bash: find / -type f -name perl -ls 2>/dev/null
...
808533 1372 -rwxr-xr-x 2 perl5 users 1404260 Aug 28 2011 /o
+pt/perl/bin/perl
1094084 1372 -rwxr-xr-x 1 perl5 users 1404260 Aug 27 2011 /h
+ome/perl5/src/perl-5.14.1/perl
6203 2832 -rwxr-xr-x 2 root root 2899960 Jan 31 2012 /u
+sr/bin/perl
...