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Full Discussion: calling a shell script in background and wait using "wait" in while loop
Top Forums Shell Programming and Scripting calling a shell script in background and wait using "wait" in while loop Post 302584849 by mihirvora16 on Monday 26th of December 2011 06:53:49 AM
Old 12-26-2011
calling a shell script in background and wait using "wait" in while loop
Hi,
I am facing a strange issue,
when i call a script from my while loop in background it doesnt go in background, despite the wait i put below the whil loop it goes forward even before the process put in background is completed.

Code:
cat abc.txt | while read -u4 line
do
   #if line contains # dont proces that line and continue to next line
   echo $line | grep '#' > /dev/null
   if [[ $? -eq 0 ]]; then
        echo ...skipping comment
        continue
   fi
   # extracting the values from cfg file
   username=`echo $line | cut -d" " -f1`
   hostname=`echo $line | cut -d" " -f2`
   dir=`echo $line | cut -d" " -f3`
   type=`echo $line | cut -d" " -f4`
   dmnname=`echo $line | cut -d" " -f5`
   mnserver=`echo $line | cut -d" " -f6`
   . ${TOOL_DIR}/formatReport.sh $hostname $dmnname $mnserver $curhour $type $reportdir $dir $curdate &
   echo "Process ID = $!"
done
wait
#further processing

file contents for abc.txt
Code:
abc  sun1  /prod/var/1  web1    web_43_1   mt_027_9043_1
def  sun2  /prod/var/2  web2    web_43_2   mt_027_9043_2
pqr  sun3  /prod/var/3  web3    web_43_3   mt_027_9043_3

---------- Post updated at 06:23 PM ---------- Previous update was at 06:14 PM ----------

Any help will be appreciated.. Guys any pointers to what can be issue?
 

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LEARN ABOUT NETBSD

wait

WAIT(1) 						    BSD General Commands Manual 						   WAIT(1)

NAME

     wait -- await process completion

SYNOPSIS

     wait [pid]

DESCRIPTION

     If invoked with no arguments, the wait utility waits until all existing child processes in the background have terminated.

     Available operands:

     pid     If a pid operand is specified, and it is the process ID of a background child process that still exists, the wait utility waits until
	     that process has completed and consumes its status information, without consuming the status information of any other process.

	     If a pid operand is specified that is not the process ID of a child background process that still exists, wait exits without waiting
	     for any processes to complete.

     The wait utility exits with one of the following values:

     0	     The wait utility was invoked with no operands and all of the existing background child processes have terminated, or the process
	     specified by the pid operand exited normally with 0 as its exit status.

     >0      The specified process did not exist and its exit status information was not available, or the specified process existed or its exit
	     status information was available, and it terminated with a non-zero exit status.

     If the specified process terminated abnormally due to the receipt of a signal, the exit status information of wait contains that termination
     status as well.

STANDARDS

     The wait command is expected to be IEEE Std 1003.2 (``POSIX.2'') compatible.

BSD
								   June 5, 1993 							       BSD
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