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tac: add usage #269

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merged 1 commit into from
Sep 29, 2023
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tac: add usage #269

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24 changes: 19 additions & 5 deletions bin/tac
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Original file line number Diff line number Diff line change
Expand Up @@ -16,11 +16,20 @@ License: perl
# tac - concatenate and print files in reverse
#

use Getopt::Std;
use File::Basename qw(basename);
use Getopt::Std qw(getopts);

my $VERSION = '0.17';
use constant EX_SUCCESS => 0;
use constant EX_FAILURE => 1;

getopts('bBrs:S:', \my %opts);
my $Program = basename($0);
my $VERSION = '0.18';

unless (getopts('bBrs:S:', \my %opts)) {
warn "$Program version $VERSION\n";
warn "usage: $Program [-br] [-s separator] [-B] [-S bytes] [file...]\n";
exit EX_FAILURE;
}
my %long = qw/
b before
B binary
Expand All @@ -39,11 +48,16 @@ if (defined $opts{separator} && $opts{regex}) {

$opts{files} = \@ARGV;

my $fh = IO::Tac->new(%opts) or die "$0: can't open file: $!\n";
my $fh = IO::Tac->new(%opts);
unless ($fh) {
warn "$Program: can't open file: $!\n";
exit EX_FAILURE;
}
print while <$fh>;
exit EX_SUCCESS;

END {
close STDOUT || die "$0: can't close stdout: $!\n";
close STDOUT || die "$Program: can't close stdout: $!\n";
$? = 1 if $? == 255; # from die
}

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