Unable to catch the redirection error when the disk is full Post: 302804629

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Top Forums Shell Programming and Scripting Unable to catch the redirection error when the disk is full Post 302804629 by Don Cragun on Thursday 9th of May 2013 03:24:41 AM

05-09-2013

Registered User

Quote:

Originally Posted by Pruthviraj_shiv

Hi Experts,

Problem summary :
I am facing the below problem on huge files when the disk is getting full on the half way through the execution.
If the disk was already full , the commands fail & everything is fine.

Sample Code :

Code:

head_rec_data_file=`head -1 sample_file.txt`
cat sample_file.txt | grep -v "$head_rec_data_file" > sample_file.load

Description : We are creating a load file to sqlldr by removing the header record. We have the above logic to achieve it.

Here when the disk is already full , any attempt to run the script fails & it is as per expectations.
But if the disk gets full half way through the execution , the command is not failing , not returning any non-zero code but completing by creating an incomplete file.

I have tried all other logics : tail +3 , perl , awk , sed . All commands behave in the same way.

Please excuse my stupidity , but i am unable to zero-in on the problem here.

What system are you using. The grep utility should exit with a non-zero exit status if any write to the output file fails (whether due to ENOSPC or any other error condition). The cat is not needed. You could use:

Code:

grep -Fv "$(head -1 sample_file.txt)" sample_file.txt > sample_file.load

instead of what you had, but it shouldn't affect the exit status of the grep command.

How are you checking the exit status? Is it the creation of sample_file.load that is failing, or is sqlldr failing to load sample_file.load into a database after the grep completes successfully?

Don Cragun

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LEARN ABOUT SUSE

applydeltarpm

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

NAME

       applydeltarpm - reconstruct an rpm from a deltarpm

SYNOPSIS

       applydeltarpm [-v] [-p] [-r oldrpm] deltarpm newrpm
       applydeltarpm -c|-C deltarpm
       applydeltarpm [-c|-C] -s sequence
       applydeltarpm -i deltarpm

DESCRIPTION

       applydeltarpm  applies a binary delta to either an old rpm or to on-disk data to re-create a new rpm. The old rpm can be specified with the
       -r option, if no rpm name is provided on-disk data is used. You can use -p to make applydeltarpm print the percentage of completion, or	-v
       to make it more verbose about its operation.

       The second an third form can be used to check if the reconstruction is possible. It may fail if the on-disk data got changed (deltarpms are
       created in a way that config file changes do not matter) or the deltarpm does not match the rpm the delta was generated with. The -c option
       selects full (i.e. slow) on-disk checking, whereas -C only checks if the filesizes have not changed.

       Instead	of  a full deltarpm a sequence id can be given with the -s sequence option. Such an id contains all the information that is needed
       to do reconstruction checking.

       Finally information about a deltarpm can be printed with the -i option.

EXIT STATUS

       applydeltarpm returns 0 if the rpm could be recreated or the checking succeeded, it returns 1 and prints an  error  message  to	stderr	if
       something failed.

SEE ALSO

       makedeltarpm(8), rpm(8)

AUTHOR

       Michael Schroeder <mls@suse.de>

								     Feb 2005							  APPLYDELTARPM(8)