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Full Discussion: compound expression in unix
Top Forums UNIX for Dummies Questions & Answers compound expression in unix Post 8947 by Kelam_Magnus on Friday 19th of October 2001 12:04:36 PM
Old 10-19-2001
use of back tics
Did you understand the use of back tics?

You can capture the output of a command or series of commands to a variable to use in a script.

Here is an example.

USERS=`who|wc -l` Saves the output to the variable "USERS". in a script you would put this above your code.

You could write.

#!/bin/sh

USERS=`wc|who -l`

If $USERS -lt 10; then frizzle; fi


This usually works best with an output that is numeric so you can compare it to something.
 

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LEARN ABOUT SUSE

ivman-launch

IVMAN-LAUNCH(8) 					      System Manager's Manual						   IVMAN-LAUNCH(8)

NAME

       ivman-launch - launch script for Ivman

SYNOPSIS

       ivman-launch [ --exit-with-session <cmd> ] [ OPTIONS ] [ COMMAND [ ARGS... ]]

DESCRIPTION

       ivman-launch  is a simple script used to launch Ivman.  Its sole purpose is to ensure Ivman is closed at the end of a user's login session.
       You can use it if your session manager does not properly close Ivman when you log out.

       ivman-launch supports the same command-line options as Ivman, and one additional option: --exit-with-session.   Thus,  there  is  no  point
       using ivman-launch if you do not need to use this option.

       If  you supply a COMMAND (with optional ARGS), the the specified command will be run after ivman is started, and ivman will be killed after
       that command exits.

OPTIONS

       --exit-with-session <cmd>
	      ivman-launch will block until the command 'cmd' terminates, at which point it will kill Ivman and exit itself.  If the command 'cmd'
	      is  not  running when ivman-launch is started, Ivman will exit immediately.  Note that this option implies Ivman will be called with
	      the '--nofork' option.  option.

       --debug --nofork --system
	      These flags be passed to the launched ivman command.

EXAMPLES

       ivman-launch --exit-with-session xinit &
	      The ivman process will be started, then the xinit process is watched.  When the xinit process exits, ivman is killed.  Placing  this
	      command  in  an  ~/.xinitrc  file would cause Ivman to launch in the background when your session begins, and exit when your session
	      ends:

       ivman-launch /usr/bin/x-window-manager
	      The ivman process is launched, then /usr/bin/x-window-manager is run, when x-window-manager exits, ivman	is  killed.   This  is	an
	      example of how ivman might be launched from Xsession in order to chain several programs together in one session.

SEE ALSO

       ivman(8) Xsession(5)

CREDITS

       This script was written by Daniele Favara.

								 10 February 2006						   IVMAN-LAUNCH(8)
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