Sometimes, this is useful like ($me) for usage info (usage: $me [ARGS]).
use strict;
use warnings;
use Path::Tiny ();
my $me = Path::Tiny::path( $0 )->basename();
my $abs_me = Path::Tiny::path( $0 )->realpath();
print "1) original: $0\n";
print "2) short : $me\n";
print "3) long : $abs_me\n";
Result:
rp@linux:local: perl ../me.pl
1) original: ../me.pl
2) short : me.pl
3) long : /home/rp/me.pl
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