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Top Forums Shell Programming and Scripting Run this grep every 10 minutes and do something based on the output Post 302929523 by kraljic on Monday 22nd of December 2014 10:59:42 AM
Old 12-22-2014
Run this grep every 10 minutes and do something based on the output

OS : Red Hat Linux 6.4
Shell : Bash

We have a file called status.txt which will have only 1 line. The content will be the string "Processing" for most of the day.

Code:
# cat status.txt
Processing
#

I want to write a shell script (notify.sh) which will be executing a grep every 10 minutes .

Once the script is executed , it should do the following


1. run a grep command every 10 minutes and check if the content of status.txt is anything other than "Processing" .

2. If the status.txt file has anything other than the string "Processing" (ie. grep -v "Processing" ) then it should echo "Completed". Actually in my real business scenario If the status.txt has anything other than "Processing" then a mail needs to be send out using Linux's mail command. But, for our testing purpose an echo "completed" should do .


3. Stop the execution of the notify.sh script (exit) after grep command managed to find anything other than the string "Processing" and printed "Complete" .

Note: I don't this to be invoked via a cronjob because in my real world scenario this logic has to be incorported as a subsection of a much bigger script. Smilie

Any idea how I can write this piece of code ?
 

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RHN_CHECK(8)							  Red Hat Network						      RHN_CHECK(8)

NAME
rhn_check - check for queued actions on RHN and execute them SYNOPSIS
/usr/sbin/rhn_check [-v] [--verbose] DESCRIPTION
rhn_check is a client program that connects to the Red Hat Network backend servers and retrieves information associated with the queued actions for this particular system. This script reads the digital server ID from /etc/sysconfig/rhn/systemid and uses that to identify the machine to the Red Hat Network. Upon successfull authentication, rhn_check will start processing the queued actions sequentially. ACTION TYPES
The following types of actions are currently processed by rhn_check: action type description () () refresh This action will refresh the hardware or software profiles of this machine with Red Hat Network. This fucntion is called as refresh(hardware) or refresh(rpmlist) new_systemid This action is used by the RHn Backend to update the Digital system ID of this machine with a new one. update_packages This action will trigger rhn_check into running a package update for a list of packages queued from the Red Hat Network. rhn_check will use modules from the up2date client to download the packages, solve dependencies and install the on the system. FILES
/etc/sysconfig/rhn/systemid The digital server ID for this machine if the system has been registered onto Red Hat Network. This file does not exist otherwise. /var/spool/up2date This directory is used by up2date to store package headers and RPM packages downloaded from Red Hat Network SEE ALSO
man pages for up2date(8) and rhnsd(8). AUTHORS
Cristian Gafton <gafton@redhat.com> Preston Brown <pbrown@redhat.com> ()
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