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Hi,
I have question about two lines from https://wiki.archlinux.org/index.php/Acpid
echo $(($(< $bl_dev/brightness) - $step)) >$bl_dev/brightness
I have question about this part
$($(<
why it is like that?
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"< file" is input redirection and works somewhat similarly to "cat file". $() executes the command and returns its output. $(()) can be used for counting.
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Thank you now it's clear.
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You might want to have a look at the guides at tldp.org.
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You might want to have a look at the guides at http://mywiki.wooledge.org/
FTFY.
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Indeed! If one does not have the information, the other will!
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