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Top Forums Shell Programming and Scripting Return variable value from a script running in background Post 302748583 by Scrutinizer on Wednesday 26th of December 2012 08:47:30 AM
Old 12-26-2012
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:

Code:
$ 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

Alternatively, ksh93 and bash 4 can use coprocesses

Last edited by Scrutinizer; 12-26-2012 at 10:18 AM..
 

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IPESCRIPT(1)						      General Commands Manual						      IPESCRIPT(1)

NAME
ipescript - Run an Ipe script (written in Lua) SYNOPSIS
ipescript script { arguments } DESCRIPTION
ipescript runs an Ipe script written in Lua. The Ipe bindings are automatically available in the script. Ipescript looks for the script in any of the script directories. The script argument should not contain the .lua extension. ENVIRONMENT VARIABLES
ipescript respects the following environment variables: IPELATEXDIR the directory where ipetoipe runs Pdflatex. IPESCRIPTS a list of directories where Ipescript will look for scripts. When this variable is not set, Ipe searches first the current directory, then ~/.ipe/scripts, and finally the system-wide Ipe script directory. When this variable is set, it should contain a list of directories, separated by semicolons. A single under- score is replaced by the system-wide Ipe script directory. IPEDEBUG set this to 1 for debugging output from ipescript. AUTHOR
Otfried Cheong REPORTING BUGS
Please report bugs using Ipe bugzilla at http://ipe7.sourceforge.net/bugzilla.html SEE ALSO
Ipe is documented fully in The Ipe Manual, which is available online at http://ipe7.sourceforge.net/manual/manual.html . August 28, 2011 IPESCRIPT(1)
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