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Top Forums Shell Programming and Scripting Passing variables between scripts Post 302157530 by bbergstrom74 on Friday 11th of January 2008 06:29:15 AM
Old 01-11-2008
Passing variables between scripts

Hi all.

I need to pass a value from a script that runs in a sub-shell, back into the calling shell like below (or into script 2 directly):

outer_script
export param=value1

script1 $param
(in script1: export param=value2)

script2 $param
($param is now value1, not value2 like i'd prefer)
end outer_script

I can't get this to work using regular variables and I have read some about shells and sub-shells and variables and I now believe that it's not possible with variables.

I guess I could always use a file to store the value in script1 and then read it in script2 using the file. But if I go this way I'd be forced to have separate files for each user that executes the script so that no conflicts occurr. But then I'd get a lot of files that mess up. I guess I could then remove each file after the script completes but what if the user terminates using Ctrl+C? I'd still have a lot of messy files after a while.

At the moment I'm leaning towards using files, but I thought I'd ask if someone knows another/better way to do this without using files?

This is in Korn Shell
 

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service(8)						      System Manager's Manual							service(8)

NAME
service - run a System V init script SYNOPSIS
service SCRIPT COMMAND [OPTIONS] service --status-all service --help | -h | --version DESCRIPTION
service runs a System V init script in as predictable an environment as possible, removing most environment variables and with the current working directory set to /. The SCRIPT parameter specifies a System V init script, located in /etc/init.d/SCRIPT. The supported values of COMMAND depend on the invoked script. service passes COMMAND and OPTIONS to the init script unmodified. All scripts should support at least the start and stop commands. As a special case, if COMMAND is --full-restart, the script is run twice, first with the stop command, then with the start com- mand. service --status-all runs all init scripts, in alphabetical order, with the status command. EXIT CODES
service calls the init script and returns the status returned by it. FILES
/etc/init.d The directory containing System V init scripts. ENVIRONMENT
LANG, TERM The only environment variables passed to the init scripts. SEE ALSO
/etc/init.d/skeleton, update-rc.d(8), init(8), invoke-rc.d(8). Jan 2006 service(8)
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