40 lines
779 B
Perl
40 lines
779 B
Perl
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#!/usr/bin/perl
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use strict;
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use warnings;
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my $maxfile = "/sys/class/leds/tpacpi\:\:kbd_backlight/max_brightness";
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my $current = "/sys/class/leds/tpacpi\:\:kbd_backlight/brightness";
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my ($max, $now, $new);
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if (open(my $m, '<', $maxfile)) {
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$max = readline($m);
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chomp $max;
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close($m);
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} else {
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print "Failed to read $maxfile\n";
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exit;
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}
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print STDERR "max = $max\n";
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if (open(my $c, '<', $current)) {
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$now = readline($c);
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chomp $now;
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close($c);
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} else {
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print "Failed to read $current\n";
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exit;
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}
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print STDERR "now = $now\n";
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if (open(my $fh, '>', $current)) {
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$new = (($now+1) % ($max+1));
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chomp $new;
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print $fh $new;
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close($fh);
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} else {
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print "Failed to write $current\n";
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exit;
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}
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print STDERR "new = $new\n";
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