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Old 02-11-2008, 07:02 AM   #1
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Registered: Oct 2007
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Check previous error status


This statement works if there is an error within the last command in
Line 01. I have to modify the code in Line 02 so that it checks for
errors in previous statements in Line 01. I want to get the error status
for previous commands in the statement in Line 01 such as the error
status for the command 'cat $ORA_LIST_FILE'. How to do it?

01 cat $ORA_LIST_FILE | wc -l 1> $ORA_LIST_COUNT_FILE_TMP 2>>
02 if [ ! $? -eq 0 ]; then
03 exit
04 fi
Old 02-11-2008, 08:25 AM   #2
Registered: Feb 2005
Distribution: Ubuntu, CentOS
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Even if you capture the output in an environment variable, you should be able to find the status in $?.

IMPOSSIBLE_TO_FIND_FILE=`ls this_file_is_not_here`

if [ $? -eq 0 ]; then
echo "Impossible file found."
echo "Impossible file not found."
Old 02-11-2008, 09:02 AM   #3
Registered: Nov 2004
Location: San Jose, CA
Distribution: Ubuntu
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The only return value available is that of the last command in a pipeline.
Old 02-11-2008, 10:07 AM   #4
Registered: Sep 2004
Location: Dayton, Oh
Distribution: Linux Mint 10, Linux Mint 11
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Your problem should go away if you skip catting the file out. Just use wc.

Old 02-13-2008, 06:32 PM   #5
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Registered: Aug 2004
Location: Sydney
Distribution: Centos 6.7, Centos 5.10
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Indeed: 'useless use of cat', also, don't use
[[ ! $? -eq 0 ]]
[[ $? -ne 0 ]]

PS Matir is correct also


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