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Full Discussion: how to grep the responce on TL1
Top Forums Shell Programming and Scripting how to grep the responce on TL1 Post 302568357 by zaxxon on Thursday 27th of October 2011 06:21:41 AM
Old 10-27-2011
You already said it yourself: Use grep. The man page reveals -q for quiet mode and if you could send anything else you do not need to > /dev/null 2>&1.
Next you can check what the content of $? is and decide what to do.
This is all you need - there are usually several ways. Just try it out and play around with it. If you get stuck at a specific point, ask again, but do not expect to get a complete solution without showing own effort.
Thanks for your understanding.
 

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LEARN ABOUT REDHAT

dvcont

DVCONT(1)						      General Commands Manual							 DVCONT(1)

NAME

       dvcont - send control commands to DV cameras

SYNOPSIS

       dvcont <command1> [ <command2> ... ]

DESCRIPTION

       dvcont is a command line tool to send control commands via an IEEE1394 link to a device that implements the AV/C specifications by the 1394
       Trade Association.  Or for the non-techies: dvcont lets you remote control your DV camera via a Firewire cable.	The following commands are
       understood:

       dev <number>
	      Select  device  number  on chain to use. (dvcont tries to automatically detect the camera. Use the dev command BEFORE any other com-
	      mands for manual control.)

       play   Tell the camera to play. If already playing, it toggles slow-motion.

       reverse
	      Tell the camera to play in reverse. If already playing, it toggles slow-motion.

       trickplay < -14 to +14 >
	      Tell the camera to play at various speeds.  0 = forward play, -14  = fastest reverse, -8 = 1X reverse, -1 =  slowest  reverse,  1  =
	      slowest forward, 8 = 1X forward, 14 = fastest forward.  (Not supported by all cameras.)

       stop   Tell the camera to stop playing.

       rewind Tell the camera to rewind. (Use in stop or play mode.)

       ff     Tell the camera to fast forward. (Use in stop or play mode.)

       pause  Tell the camera to toggle pause play.

       next   Tell the camera to go to the next frame. (Use in pause mode.)

       nextindex
	      Tell the camera to search for the next scene. (Use in pause or play mode.)

       prev   Tell the camera to go to the previous frame. (Use in pause mode)

       previndex
	      Tell the camera to search for the previous scene. (Use in pause or play mode)

       record Tell the camera to record. (Use with caution!)

       eject  Tell the camera to eject the tape. (Not supported by all cameras.)

       timecode
	      Report the timecode on tape in the format HH:MM:SS:FF.

       status Report the status of the device.

       verbose
	      Tell the program to tell you debug info.

       version
	      Tell the program to tell you the program version.

       help   Tell the program to show you a help screen.

AUTHORS

       dvcont  was  written  by  Jason Howard <jason@spectsoft.com> and Dan Dennedy <dan@dennedy.org>.	This man page was written with the help of
       help2man by Daniel Kobras <kobras@debian.org> for the Debian GNU/Linux distribution (but may be used by others).  Updated  by  Dan  Dennedy
       <dan@dennedy.org>.

dvcont								  September 2001							 DVCONT(1)
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