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Dir : ~/lib/usrmerge/

Edit File: convert-etc-shells

#!/usr/bin/perl
# vim: shiftwidth=4 tabstop=4
#
# Copyright 2016 by Marco d'Itri <md@Linux.IT>
#
# This program is free software; you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation; either version 2 of the License, or
# (at your option) any later version.

use lib "/usr/lib/usrmerge/lib";
use warnings;
use strict;
use autodie;
use v5.16;

convert('/etc/shells');
exit;

sub convert {
	my ($file) = @_;

my (@shells, @nonusr_shells, %seen_in_usr);

open(my $in, '<', $file);
	while (<$in>) {
		chomp;
		push(@shells, $_);
		$seen_in_usr{$1} = 1 if m#^/usr(/s?bin/.+)#;
		push(@nonusr_shells, $_) if m#^/s?bin/#;
	}
	close $in;

my @new_shells =					# and add them to the list
		map { "/usr$_" }				# add /usr to their path
		grep { not $seen_in_usr{$_} }	# if they do not already exist in /usr
		@nonusr_shells;					# for each shell not in /usr

return unless @new_shells;

open(my $out, '>', "$file.tmp");
	say $out $_ foreach @shells, @new_shells;
	close $out;

rename("$file.tmp", $file);
}