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head: allow '+' prefix on line count #1044

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Merged
briandfoy merged 1 commit into from
Jun 12, 2026
Merged

head: allow '+' prefix on line count #1044

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12 changes: 7 additions & 5 deletions bin/head
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Original file line number Diff line number Diff line change
Expand Up @@ -21,7 +21,7 @@ use constant EX_SUCCESS => 0;
use constant EX_FAILURE => 1;

my $Program = basename($0);
my ($VERSION) = '1.3';
my ($VERSION) = '1.4';

@ARGV = new_argv();
my %opt;
Expand All @@ -32,11 +32,11 @@ unless (getopts('n:', \%opt)) {
my $count;
if (defined $opt{'n'}) {
$count = $opt{'n'};
if (length($count) == 0 || $count =~ m/[^0-9]/) {
if ($count !~ m/\A[\-\+]?[0-9]+\Z/) {
warn "$Program: invalid number '$count'\n";
exit EX_FAILURE;
}
if ($count == 0) {
if ($count <= 0) {
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warn "$Program: count is too small\n";
exit EX_FAILURE;
}
Expand Down Expand Up @@ -89,6 +89,7 @@ sub head_fh {
sub new_argv {
my @new;
my $end = 0;
my $prev = '';

foreach my $arg (@ARGV) {
if ($arg eq '--' || $arg !~ m/\A\-/) {
Expand All @@ -97,11 +98,12 @@ sub new_argv {
next;
}

if (!$end && $arg =~ m/\A\-([0-9]+)\Z/) { # historic
if (!$end && $prev ne '-n' && $arg =~ m/\A\-([0-9]+)\Z/) { # historic
push @new, "-n$1";
} else {
push @new, $arg;
}
$prev = $arg;
}
return @new;
}
Expand Down Expand Up @@ -133,6 +135,7 @@ I<head> accepts the following options:
=item -n count

Print I<count> lines instead of the default 10.
The number must be a positive decimal integer.

=back

Expand Down Expand Up @@ -164,4 +167,3 @@ and sell this program (and any modified variants) in any way you wish,
provided you do not restrict others to do the same.

=cut

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