run same command again and again

sumeet inani · 09-01-2012, 11:34 AM

I am using tiny core.
I wanted to set all audio controls to 100
I ran
$ossmix | grep -i 'leftvol' | sed -n 's/ .*//p' | tail -n +3 | xargs ./script-to-set-all-audio-controls-to-100.txt
The script file has
echo good
ossmix "$1" 100:100
I get the feeling that the output passed to script is a long list of all controls as a result only first option gets set
The output I get is

Code:

good
Value of mixer control jack.jack1c.pcm3 set to 100.0:100.0

ossmix gives output

Code:

 Selected mixer 0/High Definition Audio 0x11060397
Known controls are:
jack.jack1c.mute ON|OFF (currently OFF)
jack.jack1c.pcm11 [<leftvol>:<rightvol>] (currently 62.9:62.9 dB)
jack.jack1c.pcm12 [<leftvol>:<rightvol>] (currently 46.4:46.4 dB)
jack.jack1c.pcm3 [<leftvol>:<rightvol>] (currently 46.4:46.4 dB)
jack.jack1c.pcm2 [<leftvol>:<rightvol>] (currently 46.4:46.4 dB)
jack.jack1c.jack6 [<leftvol>:<rightvol>] (currently 46.4:46.4 dB)
jack.jack1c.jack5 [<leftvol>:<rightvol>] (currently 46.4:46.4 dB)
jack.jack1c.pcm4 [<leftvol>:<rightvol>] (currently 46.4:46.4 dB)
jack.jack1d.mute ON|OFF (currently OFF)
jack.jack1e.mute ON|OFF (currently OFF)
record.select1.select1 <pcm3|pcm2|jack6|jack5|mix> (currently pcm3)
record.select1 [<leftvol>:<rightvol>] (currently 46.4:46.4 dB)
record.jack6 [<leftvol>:<rightvol>] (currently 46.4:46.4 dB)
misc.pcm2 [<leftvol>:<rightvol>] (currently 62.9:62.9 dB)
misc.mute1 ON|OFF (currently OFF)
misc.pcm3 [<leftvol>:<rightvol>] (currently 62.9:62.9 dB)
misc.pcm4 [<leftvol>:<rightvol>] (currently 62.9:62.9 dB)
misc.mute2 ON|OFF (currently OFF)
misc.mute3 ON|OFF (currently OFF)
vmix0-enable ON|OFF (currently OFF)
vmix0-rate <decimal value> (currently 48000) (Read-only)
vmix0-channels <Stereo|Multich> (currently Stereo)
vmix0-src <Fast|High|OFF> (currently OFF)
vmix0-outvol <monovol> (currently 25.0 dB)
vmix0-invol <monovol> (currently 25.0 dB)
vmix0.pcm7 [<leftvol>:<rightvol>] (currently 25.0:25.0 dB)
vmix0.pcm8 [<leftvol>:<rightvol>] (currently 25.0:25.0 dB)
vmix0.pcm9 [<leftvol>:<rightvol>] (currently 25.0:25.0 dB)
vmix0.pcm10 [<leftvol>:<rightvol>] (currently 25.0:25.0 dB)

sumeet inani · 09-01-2012, 11:39 AM

Seems I found the solution

ossmix | grep -i 'leftvol' | sed -n 's/ .*//p' | tail -n +3 | xargs -n 1 ./script-to-set-all-audio-controls-to-100.txt

'xargs echo' told me that all 'audio options' had been separated by space and passed as one line .
So , i saw xargs help which told :-
-n N Pass no more than N args to PROG

sumeet inani · 09-02-2012, 12:04 AM

see ahead

sumeet inani · 09-02-2012, 12:10 AM

Not Yet .
IS there a way I can write a script which takes output of "ossmix | grep -i 'leftvol' | grep -v 'known' | grep -v 'selected'| sed -n 's/ .*//p' " and apply command 'ossmix line1 100:100' 'ossmix line2 100:100' so on ..
Note: xargs I have on my tiny core is short of function (I think) because
Usage: xargs [OPTIONS] [PROG ARGS]

Run PROG on every item given by stdin

-p Ask user whether to run each command
-r Don't run command if input is empty
-0 Input is separated by NUL characters
-t Print the command on stderr before execution
-e[STR] STR stops input processing
-n N Pass no more than N args to PROG
-s N Pass command line of no more than N bytes
-x Exit if size is exceeded