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Full Discussion: Execution Problems with ASU Shell Script
Operating Systems OS X (Apple) Execution Problems with ASU Shell Script Post 302297393 by Talcon on Friday 13th of March 2009 09:06:15 AM
Old 03-13-2009
Execution Problems with ASU Shell Script
Hello. I have been trying to create a shell script that checks to see if there are software updates and if not, then exit the script. If so, then check to see if a user is logged in. If a user is logged in, it will only install the updates. If a user is not logged in, then it will display a message for the user not to login until that pop-up is gone, then it will install all software updates and reboot the machine.

The script is executed via a Cron Job. It seems to not execute after the variables are declared. Here is the code I have. Any help in this matter is greatly appreciated! Smilie

#!/bin/sh

set applesw="/usr/sbin/softwareupdate -l | grep 'Software Update' | awk '{print $5}'"

set userlogin="who | grep 'console' | awk '{print $2}'"

if [ $applesw != "following" ] then
exit 0
else

if [ $userlogin = "console" ] then
/usr/sbin/softwareupdate -i -a
exit 0
else
/usr/bin/osascript -e 'tell app "System Events" to display dialog "Software Updates are currently running. Please do not login to this machine until this message is gone. Thank you."'
/usr/sbin/softwareupdate -i -a
/sbin/shutdown -r now
fi
fi
 

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LEARN ABOUT DEBIAN

viewsu

VIEW-OS(1)						      General Commands Manual							VIEW-OS(1)

NAME

       viewsu - change (virtual) user ID or become (virtual) superuser

SYNOPSIS

       viewsu [options] [username]

DESCRIPTION

       The viewsu command is used to become another user during a login session. Invoked without a username, viewsu defaults to becoming the supe-
       ruser. The optional argument - may be used to provide an environment similar to what the user would expect had the user logged in directly.
       This  command  is  the  View-OS	counterpart  of  the  su(1)  command.	The  value of $PATH is reset to /bin:/usr/bin for normal users, or
       /sbin:/bin:/usr/sbin:/usr/bin for the superuser. This may be changed with the ENV_PATH and ENV_SUPATH definitions in /etc/login.defs.

OPTIONS

       The options which apply to the viewsu command are:

       -c, --command COMMAND
	   Specify a command that will be invoked by the shell using its -c.

       -, -l, --login
	   Provide an environment similar to what the user would expect had the user logged in directly.

	   When - is used, it must be specified as the last viewsu option. The other forms (-l and --login) do not have this restriction.

       -s, --shell SHELL
	   The shell that will be invoked.

	   The invoked shell is chosen from (highest priority first):

	   o   The shell specified with --shell.

	   o   The shell indicated in the /etc/passwd entry for the target user.

	   o	/bin/sh if a shell could not be found by any above method.

SEE ALSO

       su(1), linux.defs(5)

AUTHORS

       View-OS is a project of the Computer Science Department, University of Bologna. Project Leader: Renzo Davoli.
       <http://www.sourceforge.net/projects/view-os>

       Howto's and further information can be found on the project wiki <wiki.virtualsquare.org>.

NOTE

       Most part of the text is taken from su(1).

VIEW-OS: a process with a view					  August 5, 2009							VIEW-OS(1)
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