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BASH: weird variable division [solved]
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Dominique_71
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PostPosted: Thu Apr 18, 2013 11:08 am    Post subject: BASH: weird variable division [solved] Reply with quote

Let's go bash. I try to debug fvwm-crystal xmms2 support.

First, I have
Code:
# xmms2 server config| grep \.volume
jack.volume.left = 100
jack.volume.right = 100


Code:
xmms2 server config |grep \.volume| sed -e "s;.*.volume.* = ;;" | sed -e "s;^.*$;AddToMenu /Music 'Volume: &' Popup /Mixer:;"


give me
Code:
AddToMenu /Music 'Volume: 100' Popup /Mixer:
AddToMenu /Music 'Volume: 100' Popup /Mixer:


which is what I want. But I need only 1 line of output. I made this:

Code:
j=1 ; for i in "$(xmms2 server config)" ;
do while [[ $j -lt 2 ]] ;
    do echo $i | grep \.volume | sed -e "s;.*.volume.* = ;;" | sed -e "s;^.*$;AddToMenu /Music 'Volume: &' Popup /Mixer:;" ; j=$(($j+1)) ;
    done ; done


which give me
Code:
AddToMenu /Music 'Volume: 50' Popup /Mixer:


Only 1 line is what I want, but the volume value is divided by 2 :evil:

What is wrong with this, and what can I do?
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Last edited by Dominique_71 on Thu Apr 18, 2013 2:01 pm; edited 1 time in total
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khayyam
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PostPosted: Thu Apr 18, 2013 12:22 pm    Post subject: Reply with quote

Dominique_71 ...

I don't have xmms installed, so I used a static file as input (with the output from xmms above):

Code:
% awk '/^jack\.volume.*/{a=$NF};END{print "AddToMenu /Music '\''Volume: "a"'\'' Popup /Mixer:"}' <(xmms2 server config)
AddToMenu /Music 'Volume: 100' Popup /Mixer:

I'm not sure why you needed to itterate with a while loop as I assume you just want the value, anyhow the above is just what appeared to be the ready solution, if not then ping.

best ... khay
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ppurka
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PostPosted: Thu Apr 18, 2013 12:28 pm    Post subject: Reply with quote

This works for me. Note the "q" at the end. I don't have xmms2, so I am just assuming some string as the input.
Code:
~» echo "jack.volume.left = 100
jack.volume.right = 100
xmms.something.some = 30
xmms.a.something = 200" | sed -n "/\.volume/{s/.*= \([0-9]\+\)$/AddToMenu \/Music 'Volume: \1' Popup \/Mixer:/p;q}"
AddToMenu /Music 'Volume: 100' Popup /Mixer:


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Dominique_71
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PostPosted: Thu Apr 18, 2013 12:46 pm    Post subject: Reply with quote

Thank you both.

I was underestimating sed. I think ppurka's solution is the most appropriate in my case. It work fine at the shell, now I have to put it into fvwm and see what append with the special characters.

EDIT: One more quoting and a few more escape, and it work fine in fvwm :roll:
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