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Full Discussion: Handling Errors in Shell Scripts
Top Forums UNIX for Dummies Questions & Answers Handling Errors in Shell Scripts Post 302100900 by kbrede on Sunday 24th of December 2006 07:43:03 AM
Old 12-24-2006
In bash the return code of a prog is in $?. Usually exit status 0 = success and 1 = failure.

If we look in the manpage for grep we find:

Normally, exit status is 0 if selected lines are found and 1 otherwise. But the exit status is 2 if an error occurred, unless the -q or --quiet or --silent option is used and a selected line is found.


Based on that, an example of usage:

---------------------------
#!/bin/bash

/bin/grep search_string file

if [ $? -eq 1 ];then
echo "String not found."
fi
---------------------------

Hope that gets you on your way.
Kent
 

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LEARN ABOUT REDHAT

adsl-setup

ADSL-SETUP(8)						      System Manager's Manual						     ADSL-SETUP(8)

NAME

       adsl-setup - Shell script to configure Roaring Penguin PPPoE client

SYNOPSIS

       adsl-setup

DESCRIPTION

       adsl-setup  is  a shell script which prompts you for various pieces of information and sets up an /etc/sysconfig/network-scripts/ifcfg-ppp0
       configuration script for the adsl-start, adsl-stop and adsl-connect scripts.

AUTHOR

       adsl-setup was written by David F. Skoll <dfs@roaringpenguin.com>.

       The pppoe home page is http://www.roaringpenguin.com/pppoe/.

SEE ALSO

       pppoe(8), adsl-start(8), adsl-stop(8), adsl-connect(8), pppd(8),  pppoe.conf(5),  adsl-status(8),  pppoe-sniff(8),  pppoe-relay(8),  pppoe-
       server(8)

4th Berkeley Distribution					 21 February 2000						     ADSL-SETUP(8)
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