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Full Discussion: Return variable value from a script running in background
Top Forums Shell Programming and Scripting Return variable value from a script running in background Post 302748539 by Shaishav Shah on Wednesday 26th of December 2012 06:13:21 AM
Old 12-26-2012
Return variable value from a script running in background
I have a script which runs a script in the background. Now the script running in background returns some variable value and i want to catch return value in the parent script.

e.g.
Parent Script :
Code:
#!/bin/bash
./Back.sh &
pid=$!
echo "a=$a"
echo "b=$b"
echo "d=$((a+b))"
wait $pid

Child Script run in background
Code:
a=4
b=5
c=6

Now when i run ./BackGroundProcess.sh , expected output is :
a=4
b=5
d=9

what i get is
a=
b=
d=0

Any suggestions or approach how I can retrieve a variable value from a script running in background ?
 

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LEARN ABOUT OSF1

uudemon

uudemon(4)						     Kernel Interfaces Manual							uudemon(4)

NAME

       uudemon.admin,  uudemon.cleanu,	uudemon.hour,  uudemon.poll  -	Administrative shell scripts for polling remote systems, cleaning up spool
       directories, reporting status to the system administrator, and routine invocations of the uuxqt and uusched daemons

SYNOPSIS

       These shell scripts reside in the following directory:
	  /usr/lib/uucp

DESCRIPTION

       All the scripts can be run from the command line or can be run automatically by the cron daemon. To automatically run the  scripts,  remove
       the comment character (#) from the beginning of the relevant line in the /var/spool/cron/crontabs/uucp file.

       This  script  reports  status  to  the system administrator. It issues the uustat command to find out the status of uucp jobs. It mails the
       results to the uucp login ID. The script may be modified to send mail to any login ID such as the uucp administrative login ID  (uucpa)	or
       root.  This script cleans up the /var/spool/uucp and /var/spool/uucppublic directories by running the uucleanup command. The uucleanup com-
       mand is run with the following parameters: -C7, -D7, X2, -o2, -W1.  This script runs the uusched and uuxqt daemons in the background.  This
       script  polls  the  systems  listed  in	the  /usr/lib/uucp/Poll file.  The uudemon.poll script should be scheduled before the uudemon.hour
       script. This allows uudemon.poll to create any command files before cron runs the uudemon.hour script.

FILES

       Contains the uudemon.admin, uudemon.cleanu, uudemon.hour and uudemon.poll files.  Contains the uucp file.

RELATED INFORMATION

       Commands: cron(8), uucleanup(8), uusched(8), uuxqt(1)

       Files: /usr/lib/uucp delim off

																	uudemon(4)
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