I usually use the below on ActiveState perl. Although I believe it also works on Linux.
use strict;
use warnings;
use English;
use File::Basename qw( dirname );
use File::Spec::Functions qw( rel2abs );
my $script_dir = rel2abs( dirname( $PROGRAM_NAME ) );
print "$script_dir\n";
You could leave out the "use English" and replace $PROGRAM_NAME with $0
Update:
There is an implicit assumption in the above code, that you are not talking about a CGI script.
You should also look at How do I get the full path to the script executing?
data64
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