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Unable to check if my command succeeded

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Top Forums Shell Programming and Scripting Unable to check if my command succeeded
# 1  
Old 12-02-2015
Error Unable to check if my command succeeded
Hi,

Is there a way to check if the openssl part of the below execution returns non zero without freezing the flow of the script ?

Code:
var1=$(echo | openssl s_client -connect $url 2>/dev/null | openssl x509 -noout -issuer -subject -dates)
echo $?

Output: 0

while i was expecting the output to be non zero for failing URLs.

I understand why the output shows 0 ... but what i wish to know is how can i grab the actual return code of openssl in the next line.

I tried something like
Code:
var1=$(echo | openssl s_client -connect $url 2>/dev/null | openssl x509 -noout -issuer -subject -dates)
->
openssl s_client -connect $url 2>/dev/null | openssl x509 -noout -issuer -subject -dates
or
test=$(openssl s_client -connect $url 2>/dev/null | openssl x509 -noout -issuer -subject -dates)

but both the above tricks freezes the flow and the script does not complete the while loop.

Can u help ?
# 2  
Old 12-02-2015
In bash you can query PIPESTATUS:
Code:
var1=$(echo | openssl s_client -connect $url 2>/dev/null | openssl x509 -noout -issuer -subject -dates)
echo ${PIPESTATUS[0]} ${PIPESTATUS[1]} ${PIPESTATUS[2]}

where ${PIPESTATUS[1]} is the second command (i.e. the first openssl).
Note that $? is the status of the last command.
For other/all shells you can do
Code:
var1=$(echo | openssl s_client -connect $url 2>/dev/null)
stat=$?
if [ $stat -ne 0 ]
then
  echo "bad exit status $stat"
else
  var1=$(echo "$var1" | openssl x509 -noout -issuer -subject -dates)
fi

This User Gave Thanks to MadeInGermany For This Post:
mohtashims
# 3  
Old 12-08-2015
In bash, pipefail option will do the trick.

Set the pipefail option in top of your bash script.

Code:
set -o pipefail

-Ranga
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