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Full Discussion: Who -u gives different output if run from cron than if run from terminal?
Top Forums Shell Programming and Scripting Who -u gives different output if run from cron than if run from terminal? Post 302741429 by latimer on Saturday 8th of December 2012 09:24:00 PM
Old 12-08-2012
Who -u gives different output if run from cron than if run from terminal?
If I run 'who -u' interactively or from a script invoked through bash in a tty on my Ubuntu 12LTS box I get an output like this:
testuser pts/0 Dec 9 02:32 . 2163 (host.xx.yy)

running the same through cron I get:
testuser pts/0 2012-12-09 02:32 00:05 2163 (host.xx.yy)

I want to check for idle ttys and thus tried to look at field 6 but my script fails because if run through cron I get the PID instead of the idle time.

I can not find anything about output format in the man page of who.
On the info coreutils 'who invocation' I find that the TZ variable affects the output but TZ is not set in my shell nor in the cron environment.
(BTW. I don't like the info pages because I cannot filter them properly)

Is there an easy way to get a standardized output from who?
Last edited by latimer; 12-08-2012 at 10:34 PM.. Reason: additional info
 

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LEARN ABOUT OSF1

uudemon.cleanu

uudemon(4)						     Kernel Interfaces Manual							uudemon(4)

NAME

       uudemon.admin,  uudemon.cleanu,	uudemon.hour,  uudemon.poll  -	Administrative shell scripts for polling remote systems, cleaning up spool
       directories, reporting status to the system administrator, and routine invocations of the uuxqt and uusched daemons

SYNOPSIS

       These shell scripts reside in the following directory:
	  /usr/lib/uucp

DESCRIPTION

       All the scripts can be run from the command line or can be run automatically by the cron daemon. To automatically run the  scripts,  remove
       the comment character (#) from the beginning of the relevant line in the /var/spool/cron/crontabs/uucp file.

       This  script  reports  status  to  the system administrator. It issues the uustat command to find out the status of uucp jobs. It mails the
       results to the uucp login ID. The script may be modified to send mail to any login ID such as the uucp administrative login ID  (uucpa)	or
       root.  This script cleans up the /var/spool/uucp and /var/spool/uucppublic directories by running the uucleanup command. The uucleanup com-
       mand is run with the following parameters: -C7, -D7, X2, -o2, -W1.  This script runs the uusched and uuxqt daemons in the background.  This
       script  polls  the  systems  listed  in	the  /usr/lib/uucp/Poll file.  The uudemon.poll script should be scheduled before the uudemon.hour
       script. This allows uudemon.poll to create any command files before cron runs the uudemon.hour script.

FILES

       Contains the uudemon.admin, uudemon.cleanu, uudemon.hour and uudemon.poll files.  Contains the uucp file.

RELATED INFORMATION

       Commands: cron(8), uucleanup(8), uusched(8), uuxqt(1)

       Files: /usr/lib/uucp delim off

																	uudemon(4)
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