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Operating Systems Linux SuSE Wall execution problems from cron Post 302786549 by lutador72 on Wednesday 27th of March 2013 05:29:37 PM

Old

03-27-2013

Registered User

Wall execution problems from cron

So I've been tasked with creating a shell script to run in a cron every few minutes to check duplex settings on my eth0 nic card. I would like for the server to send a wall message to whoever is on the console or in a terminal session. Below is what I have so far.

Code:

0,10,20,30,40,50 * * * *  /home/acc4000d/test10

I have it in my root's cron so that wall will run. Can someone tell me what I'm missing for the wall to actually happen?

Script looks like this;

Code:

#!/bin/bash
DUPLEX=$(ethtool eth0 | sed -n 's/Duplex:\(.*\)/\1/p')
if [ $DUPLEX = Half ]
then /usr/bin/wall duplex_error 
fi

annnnd the wall message file is called "duplex_error"

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wall

WALL(1) 							Linux User's Manual							   WALL(1)

NAME

       wall -- send a message to everybody's terminal.

SYNOPSIS

       wall [ message ]

DESCRIPTION

       Wall  sends  a message to everybody logged in with their mesg(1) permission set to yes. The message can be given as an argument to wall, or
       it can be sent to wall's standard input. When using the standard input from a terminal, the message should be terminated with the  EOF  key
       (usually Control-D).

       The length of the message is limited to 20 lines.

NOTES

       There  is  an undocumented (well not anymore..) option, "-n", that supresses the banner printed by wall .  This is for usage by rwalld (8).
       Wall will not allow you to use that flag if wall is installed set-group-id and the user executing wall is not root.

       For every invocation of wall a notification will be written to syslog, with facility LOG_USER and level LOG_INFO.

ENVIRONMENT

       Wall ignores the TZ variable - the time printed in the banner is based on the systems local time.

SEE ALSO

       mesg(1), rpc.rwalld(8).

AUTHOR

       Miquel van Smoorenburg, miquels@cistron.nl

								 12 September 2000							   WALL(1)