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Top Forums UNIX for Beginners Questions & Answers How to define multiple environment variables in a shell script? Post 303045884 by Chubler_XL on Thursday 16th of April 2020 11:47:53 PM
Old 04-17-2020
EXPORT allows shell variables to be passed onto sub processes of the current shell not back up to the calling process.

If you want a child script to set environment variables in the parent (calling) script source the child script. Example:
Code:
$ NAME=
$ cat sc_1
abc="Test abc"
def=${abc% *}
export NAME=$def
$ ./sc_1
$ echo $NAME

$ . ./sc_1
$ echo $NAME
Test

See how the second instance sc_1 is sourced into the current shell by using . ./sc_1 (or source ./sc_1 if you prefer the clearer long-hand form). Any variables set will now be in the current shell. Think of this as reading the commands in the child script into the current process not spawning a new shell to run sc_1 which loses any environment vars after it finishes.
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UCF.CONF(5)						      Debian GNU/Linux manual						       UCF.CONF(5)

NAME
ucf.conf - site-wide configuration file for ucf SYNOPSIS
/etc/ucf.conf DESCRIPTION
The file /etc/ucf.conf is actually a Bourne Shell snippet included during the package build process, and hence you may put any shell direc- tive in that file (just make very sure you know what you are doing). All the variables have reasonable default values, and some may be overridden on a per run or a per individual basis by using environment variables, and all configurable variables can be overridden by options to the scripts themselves. The value of a variable can be set so: a) Defaults exist in the rules file. These are the values used if no customization is done. b) Some variables can be set in the config file /etc/ucf.conf. These values override the defaults. c) Some variables can also be set by setting a corresponding environment variable. These values override the config file and the defaults. d) Using script command line options. All configurable variables may be set by this method, and will override the other methods above. Configuration File options At the moment, the user modifiable variables supported are: DEBUG Debugging information: The default value is 0 (no debugging information is printed). To enable debugging output, set the value to 1. VERBOSE Verbosity: The default value is 0 (quiet). To change the default behavior, set the value to 1. conf_force_conffold Force the installed file to be retained. The default is to have this variable unset, which makes the script ask in case of doubt. This can be overridden by the environment variable UCF_FORCE_CONFFOLD conf_force_conffnew Force the installed file to be overridden. The default is to have this variable unset, which makes the script ask in case of doubt. This can be overridden by the environment variable UCF_FORCE_CONFFNEW conf_source_dir This is the directory where the historical md5sums for a file are looked for. Specifically, the historical md5sums are looked for in either the file ${filename}.md5sum, or the subdirectory ${filename}.md5sum.d/ conf_old_mdsum_file Force the historical md5sums to be read from this file, rather than defaulting to living in the source directory. Set- ting this option overrides settings in the environment variable UCF_OLD_MDSUM_FILE Files System-wide defaults are placed in /etc/ucf.conf, SEE ALSO
ucf(1), BUGS
There are no bugs. Any resemblance thereof is delirium. Really. AUTHOR
This manual page was written by Manoj Srivastava <srivasta@debian.org>, for the Debian GNU/Linux system. Debian Feb 12 2002 UCF.CONF(5)
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