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Calling a script from master script to get value from called script


 
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# 1  
RedHat Calling a script from master script to get value from called script

I am trying to call a script(callingscript.sh) from a master script(masterscript.sh) to get string type value from calling script to master script. I have used scripts mentioned below.
Code:
#masterscript.sh
 
./callingscript.sh
echo $fileExist
 
#callingscript.sh
 
echo "The script is called"
fileExist="XYZ"
export $fileExist

When I run the masterscript.sh in the output one blank line is coming but I want to print "XYZ"

Please help ASAP.

Last edited by vbe; 03-14-2014 at 11:51 AM.. Reason: code tags
# 2  
We have the emergency forum for urgent requests.
Here we are at best effort.
--
Environment cannot be returned from a child process (called process) to its parent process.
Only a return value (integer) and output text can be returned.

The following includes ./callingscript.sh within ./masterscript.sh:

Code:
#masterscript.sh
. ./callingscript.sh
echo $fileExist

Code:
#callingscript.sh
echo "The script is called"
fileExist="XYZ"
export fileExist # promote to environment - will be inherited by child processes.

Note the . before ./callingscript.sh, it means sourcing, not calling.
# 3  
Apologies for typos...
Q: How does the master script know what child script is doing?
A: It doesn't.
Therefore your attempt at reading a similarly named variable falls back the default of
a NULL string.
You could always save the contents of "$fileExist" to disk and re-read with a similar
variable name as above.
This way any shell could re-read it...
 

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