tjh.dev
Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel
os
linux
1#!/usr/bin/env perl
2# SPDX-License-Identifier: GPL-2.0
3# Prefix all lines with "# ", unbuffered. Command being piped in may need
4# to have unbuffering forced with "stdbuf -i0 -o0 -e0 $cmd".
5use strict;
6use IO::Handle;
7
8binmode STDIN;
9binmode STDOUT;
10
11STDOUT->autoflush(1);
12
13my $needed = 1;
14while (1) {
15 my $char;
16 my $bytes = sysread(STDIN, $char, 1);
17 exit 0 if ($bytes == 0);
18 if ($needed) {
19 print "# ";
20 $needed = 0;
21 }
22 print $char;
23 $needed = 1 if ($char eq "\n");
24}