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 :

#!/bin/bash
./Back.sh &
pid=$!
echo "a=$a"
echo "b=$b"
echo "d=$((a+b))"
wait $pid

a=4
b=5
c=6

Hi,


Check this http://www.unix.com/shell-programmin...nd-parent.html


Cheers,
Ranga

Thanks rangarasan.

A child script cannot pass variables to a parent script. There are ways to read the output of the child script in the parent script. For example:

$ cat back.sh
echo 4 5

$ cat fore.sh
TESTFIFO=./testfifo
mkfifo "$TESTFIFO"
./back.sh > "$TESTFIFO" &
echo hello
read a b < "$TESTFIFO"
echo "a=$a"
echo "b=$b"
echo "d=$((a+b))"
rm "$TESTFIFO"

$ ./fore.sh
hello
a=4
b=5
d=9

Thanks dude.

Though I already tried this approach by redirecting output to TEMP.sh from the script running in background and then calling ./TEMP.sh from the script running in forground.

Though thanks for your input.

TR,
Shaishav