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