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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 302310697 by prathima on Sunday 26th of April 2009 12:30:22 PM
Old 04-26-2009
How to capture actual error message when a command fails to execute
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.

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?
 

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LEARN ABOUT DEBIAN

x2sys_merge

X2SYS_MERGE(1gmt)					       Generic Mapping Tools						 X2SYS_MERGE(1gmt)

NAME

       x2sys_merge - Merge an updated COEs tables

SYNOPSIS

       x2sys_merge -Amain_COElist.d -Mnew_COElist.d

DESCRIPTION

       x2sys_merge  will read two crossovers data base and output the contents of the main one updated with the COEs in the second one. The second
       file should only contain updated COEs relatively to the first one.  That is, it MUST NOT contain any new  two  tracks  intersections  (This
       point  is  NOT checked in the code). This program is useful when, for any good reason like file editing NAV correction or whatever, one had
       to recompute only the COEs between the edited files and the rest of the database.

       -A     Specify the file main_COElist.d with the main crossover error data base.

       -M     Specify the file new_COElist.d with the newly computed crossover error data base.

OPTIONS

       No space between the option flag and the associated arguments.

       EXAMPLES
	      To update the main COE_data.txt with the new COEs estimations saved in the smaller COE_fresh.txt, try

	      x2sys_merge -ACOE_data.txt -MCOE_fresh.txt > COE_updated.txt

SEE ALSO

       x2sys_binlist(1), x2sys_cross(1), x2sys_datalist(1), x2sys_get(1), x2sys_init(1), x2sys_list(1), x2sys_put(1), x2sys_report(1)

GMT 4.5.7							    15 Jul 2011 						 X2SYS_MERGE(1gmt)
All times are GMT -4. The time now is 12:30 PM.
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