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Full Discussion: Ps command
Top Forums UNIX for Beginners Questions & Answers Ps command Post 303004965 by apmcd47 on Wednesday 11th of October 2017 10:03:38 AM
Old 10-11-2017
Quote:
Originally Posted by dummyx
Hi,
I'm trying to learn Unix and I've yet the first problems on a basic command like ps.

If I have 2 different parameters, one more "restrictive" than the other, which of those controls? Let me explain:
-a: Select all processes except both session leaders and processes not associated with a terminal.
-d: Select all processes except session leaders.
If I use ps -ad is the same thing that use ps -da? If the more "restrictive is a, is the d parameter superfluous?

a command like ps -edaf what processes will show?

Thank you!
Assuming you have access to a Unix or Linux machine, why not try all combinations and find out? Assuming the output is one process listed per line you could pipe the output of ps into wc -l just to see how long each listing would be. Then you can draw your own conclusions.

Andrew
Last edited by rbatte1; 10-12-2017 at 10:10 AM.. Reason: Retro-fit ICODE tags into quoted post
 

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LEARN ABOUT DEBIAN

uvcdynctrl

UVCDYNCTRL(1)							 uvcdynctrl 0.2.1						     UVCDYNCTRL(1)

NAME

       uvcdynctrl-0.2.1 - libwebcam command line tool

SYNOPSIS

       uvcdynctrl [OPTIONS]... [VALUES]...

DESCRIPTION

       uvcdynctrl 0.2.1

       Manage dynamic controls in uvcvideo

       -h, --help
	      Print help and exit

       -V, --version
	      Print version and exit

       -l, --list
	      List available cameras

       -i, --import=filename
	      Import dynamic controls from an XML file

       -a, --addctrl=vid
	      Import dynamic controls for vid from default location

       -v, --verbose
	      Enable verbose output  (default=off)

       -d, --device=devicename
	      Specify the device to use  (default=`video0')

       -c, --clist
	      List available controls

       -g, --get=control
	      Retrieve the current control value

       -s, --set=control
	      Set a new control value (For negative values: -s 'My Control' -- -42)

       -f, --formats
	      List available frame formats

       -S, --save=filename
	      Save device controls state to a file

       -L, --load=filename
	      Load device controls state from a file

SEE ALSO

       The  full  documentation  for  uvcdynctrl is maintained as a Texinfo manual.  If the info and uvcdynctrl programs are properly installed at
       your site, the command

	      info uvcdynctrl

       should give you access to the complete manual.

May 2011								20							     UVCDYNCTRL(1)
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