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Full Discussion: How to capture actual error message when a command fails to execute
Top Forums Shell Programming and Scripting How to capture actual error message when a command fails to execute Post 302310701 by devtakh on Sunday 26th of April 2009 01:14:13 PM
Old 04-26-2009
Quote:
Originally Posted by prathima
I want to capture actual error message in case the commands I use in my shell script fails.

For eg:
ls -l abc.txt 2>>errorlog.txt

In this case I understand the error message is written to the errorlog.txt and I assume its bacause the return code from the command ls -l abc might return 2 if "abc" doesnt exists.

Quote:
Here, 2 is not the return code. 2 is the File descriptor value(FD). By default, the standard inputs FD is 0, std o/p is 1 and std error is 2. That is the reason why your std errors are getting redirected to the errorlog file. Therefore any error (may be file not exits or permission issue or anything) will be redirected to the error file
My question is: How about if the command return non zero return code and is not equal to 2?

I want to do something like this:

ls -l abc.txt
if [$? -ne 0]
then
echo $errorMessage >> errorlog.txt
fi

where I want actual error message that the command has returned to be written to errorlog.txt. Just for understanding I used $errorMessage but I assume there should be some means to capture the actual error message which can later be stored in errorMessage or written directly to errorlog.txt.
Can someone please help?
Quote:
So for printing the error message, you dont need a IF loop. It is generally use, if you want to do something different
cheers,
Devaraj Takhellambam
 

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LEARN ABOUT ULTRIX

elcsd

elcsd(8)						      System Manager's Manual							  elcsd(8)

Name
       elcsd - error logging daemon

Syntax
       /etc/elcsd

Description
       The  daemon  logs  hardware  and system-related error packets, or error messages, from the kernel errorlog buffer to the file syserr.<host-
       name>.  Hostname is the name of the local system.  At system startup, the daemon is invoked out of For further information, see The  daemon
       must be running whenever the system is in multiuser mode.

       To invoke the daemon in single-user mode, use the command with the -s option.

       You  can  configure  the daemon to log error packets locally from a remote ULTRIX host, or you can configure the daemon to send local error
       packets to a remote system.  Do this by changing the entries in the file.  For further information, see The daemon uses an  internet  data-
       gram socket to log information across systems.

       Parameters  related  to	such as the desired location for the errorlog file or files, as well as instructions for local and remote logging,
       can be specified in the error logging configuration file, For further information, see

Restrictions
       You must have superuser privileges to invoke the daemon.

Diagnostics
       The daemon logs general status and error messages to in multiuser mode.	This file is purged whenever the daemon is restarted.

Files
See Also
       elcsd.conf(5), eli(8), rc(8), uerf(8)
       Guide to the Error Logger

4th Berkeley Distribution														  elcsd(8)
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