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ksh view std err state

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# 1  
Old 04-01-2012
ksh view std err state
I would like to know if a command works.

"command" 2>/dev/null

When I issue the command, the error is suppressed. How can I tell whether there was an error?
# 2  
Old 04-01-2012
Code:
"command" 2>/dev/null
if [ $? -ne 0 ];then 
echo "error encountered" 
fi

$? store the status of immediate previous executed command.
# 3  
Old 04-01-2012
Query the shell built-in variable "$?" which shows the return code from the previous command. typically the return code will be 0 for success and non-zero for an error.

Code:
#!/bin/ksh
ls xyz 2>/dev/null
if [[ $? > 0 ]]; then
  print error
fi

exit 0

# 4  
Old 04-01-2012
Code:
"command" 2>/dev/null || echo "there was an error (RC=$?)"

Code:
if "command" 2>/dev/null; then 
  echo success
else 
  echo "there was an error (RC=$?)" 
fi

Last edited by Scrutinizer; 04-01-2012 at 06:49 PM..
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