##
ls -l /usr/local/bin/perl*
##
##
... /usr/local/bin/perl -> perl5.12.2
... /usr/local/bin/perl5.10.1.threads
... /usr/local/bin/perl5.10.1
... /usr/local/bin/perl5.12.2
... /usr/local/bin/perl5.16.0
...
... /usr/local/bin/perltest -> perl5.16.0
##
##
#!/usr/local/bin/perl5.10.1.threads -w