[SOLVED] how do I extract the mixer volume?

Question

I'm setting up openbox to use my media keys, and want to show an OSD with the current volume(%) when I press volume up or down.
I have come this far:
amixer get Master |grep % |awk '{print $4}'|sed 's/.//'
this gives me
51%]
How do I get rid of the last bracket?
Is there an easier way to get this value? (probably. I don't often do something like this )
Through google I found how to remove the first char, and I also found how to remove the last char using sed. However I couldn't find anything that combines the two.
Any good ideas?
Last edited by madeye (2010-01-26 20:54:58)

Answer 1

And then I learned something new again
Actually I didn't know about the tr command.
Thanks for all the solutions.
EDIT:
In case anyone is interested in my volume script, here it is:
#!/bin/sh
case $1 in
up)
/usr/bin/amixer -q -c 0 sset 'Master' 5%+
down)
/usr/bin/amixer -q -c 0 sset 'Master' 5%-
/usr/bin/amixer -q -c 0 sset 'Master' toggle
esac
CURVOL=`amixer get Master | awk '/Mono.+/ {print $6=="[off]"?$6:$4}' | tr -d '[]'`
notify-send "Volume: $CURVOL"
I have added the following to my ~/.config/openbox/lxde-rc.xml
<!-- volume control -->
<keybind key="XF86AudioRaiseVolume">
<action name="Execute">
<command>amix.sh up</command>
</action>
</keybind>
<keybind key="XF86AudioLowerVolume">
<action name="Execute">
<command>amix.sh down</command>
</action>
</keybind>
<keybind key="XF86AudioMute">
<action name="Execute">
<command>amix.sh</command>
</action>
</keybind>
Last edited by madeye (2010-01-26 21:18:44)