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Top Forums Shell Programming and Scripting How to restart the same step when return value is not equal to zero? Post 302895866 by reignangel2003 on Thursday 3rd of April 2014 04:17:20 AM
Old 04-03-2014
How to restart the same step when return value is not equal to zero?

Hi Again Guru's

One of the requirements for the shell script is that when the return value of a given function is not equal to zero, it should have the option for the user to re-execute the function that has failed.

Example:
the script has different functions:
func_1()
func_2()
func_3()
func_4()
....


when func_1 fails, it should ask the user to make some necessrary corrections and once done, it should re-execute that same function.

Any idea will help.

below is the sample code.
Code:
#!/usr/bin/sh

#Function to get return value
func_getRetValue()
{
retValue=$?

if [ $retValue -gt 0 ]
then
   echo "Encountered ERROR"
	
	func_pause "Press any key when ready ..."
else
   echo "NO ERROR FOUND"
	
	func_pause "Press Any key to continue..."
	
fi

}

#function to wait for the user's prompt before proceeding
func_pause()
{
   read -p "$*"
}

#Function to check if supplemental logging is enabled in Aexeo Database
func_enableSupplementalLoggingOnAexeoDB()
{

sqlplus -s ${userName}/${password}@//${hostname}/${oraInstance} <<EOF > ${logDir}/output.out
	set heading off
	SELECT  SUPPLEMENTAL_LOG_DATA_MIN from v\$database;
EOF

#Check the output of the sql statement if it is "YES"
#if not run sql statemet to alter the table

status=`cat ${logDir}/output.out | sed '/^$/d' | tail -3`

if [ $status == "YES" ]
then
     echo "Minimal supplemental logging is enabled in Aexeo Database"
	 echo "Status is ${status}"
elif [ $status != "YES" ]
then
    echo "Supplemental logging is not enabled"
	echo "Please login to Database and set SUPPLEMENTAL_LOG_DATA_MIN to \"YES\" "
fi

#func_pause "Once corrected press any key to continue ..."
}

func_createPartitionsVPDUsers()
{
   
}

#-----------------
# Main
#-----------------

step="${1:-0}"

while :
do
   case $step in
      0) : ;;
      1) echo "Running Step 1 : Check supplemental logging in Aexeo Database is enabled"
	     func_enableSupplementalLoggingOnAexeoDB
		 
		 
		 retValue=$?
		 
		 if [ $retValue -gt 0 ]
		 then
		    echo "Encountered ERROR"
			
			func_pause "Press any key when ready ..."
		 else
		    echo "NO ERROR FOUND"
			
			func_pause "Press Any key to continue..."
			
		 fi
	  
	  ;;
	  2) func_createPartitionsVPDUsers 
	  
	  ;;
      *) exit ;;
   esac
   
   ((step=${step} + 1))
done

 

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exit(1) 							   User Commands							   exit(1)

NAME
exit, return, goto - shell built-in functions to enable the execution of the shell to advance beyond its sequence of steps SYNOPSIS
sh exit [n] return [n] csh exit [ ( expr )] goto label ksh *exit [n] *return [n] DESCRIPTION
sh exit will cause the calling shell or shell script to exit with the exit status specified by n. If n is omitted the exit status is that of the last command executed (an EOF will also cause the shell to exit.) return causes a function to exit with the return value specified by n. If n is omitted, the return status is that of the last command exe- cuted. csh exit will cause the calling shell or shell script to exit, either with the value of the status variable or with the value specified by the expression expr. The goto built-in uses a specified label as a search string amongst commands. The shell rewinds its input as much as possible and searches for a line of the form label: possibly preceded by space or tab characters. Execution continues after the indicated line. It is an error to jump to a label that occurs between a while or for built-in command and its corresponding end. ksh exit will cause the calling shell or shell script to exit with the exit status specified by n. The value will be the least significant 8 bits of the specified status. If n is omitted then the exit status is that of the last command executed. When exit occurs when executing a trap, the last command refers to the command that executed before the trap was invoked. An end-of-file will also cause the shell to exit except for a shell which has the ignoreeof option (See set below) turned on. return causes a shell function or '.' script to return to the invoking script with the return status specified by n. The value will be the least significant 8 bits of the specified status. If n is omitted then the return status is that of the last command executed. If return is invoked while not in a function or a '.' script, then it is the same as an exit. On this man page, ksh(1) commands that are preceded by one or two * (asterisks) are treated specially in the following ways: 1. Variable assignment lists preceding the command remain in effect when the command completes. 2. I/O redirections are processed after variable assignments. 3. Errors cause a script that contains them to abort. 4. Words, following a command preceded by ** that are in the format of a variable assignment, are expanded with the same rules as a vari- able assignment. This means that tilde substitution is performed after the = sign and word splitting and file name generation are not performed. ATTRIBUTES
See attributes(5) for descriptions of the following attributes: +-----------------------------+-----------------------------+ | ATTRIBUTE TYPE | ATTRIBUTE VALUE | |Availability |SUNWcsu | +-----------------------------+-----------------------------+ SEE ALSO
break(1), csh(1), ksh(1), sh(1), attributes(5) SunOS 5.10 15 Apr 1994 exit(1)
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