| #!/usr/bin/perl | |
| # SPDX-License-Identifier: GPL-2.0 | |
| # Prefix all lines with "# ", unbuffered. Command being piped in may need | |
| # to have unbuffering forced with "stdbuf -i0 -o0 -e0 $cmd". | |
| use strict; | |
| binmode STDIN; | |
| binmode STDOUT; | |
| STDOUT->autoflush(1); | |
| my $needed = 1; | |
| while (1) { | |
| my $char; | |
| my $bytes = sysread(STDIN, $char, 1); | |
| exit 0 if ($bytes == 0); | |
| if ($needed) { | |
| print "# "; | |
| $needed = 0; | |
| } | |
| print $char; | |
| $needed = 1 if ($char eq "\n"); | |
| } |