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:
$ cat sc_1
abc="Test abc"
def=${abc% *}
export NAME=$def
$ ./sc_1
$ echo $NAME

$ . ./sc_1
$ echo $NAME

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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SCRIPT(1)						    BSD General Commands Manual 						 SCRIPT(1)

script -- make typescript of terminal session SYNOPSIS
script [-a] [-k] [-q] [-t time] [file [command ...]] DESCRIPTION
The script utility makes a typescript of everything printed on your terminal. It is useful for students who need a hardcopy record of an interactive session as proof of an assignment, as the typescript file can be printed out later with lpr(1). If the argument file is given, script saves all dialogue in file. If no file name is given, the typescript is saved in the file typescript. If the argument command ... is given, script will run the specified command with an optional argument vector instead of an interactive shell. Options: -a Append the output to file or typescript, retaining the prior contents. -k Log keys sent to program as well as output. -q Run in quiet mode, omit the start and stop status messages. -t time Specify time interval between flushing script output file. A value of 0 causes script to flush for every character I/O event. The default interval is 30 seconds. The script ends when the forked shell (or command) exits (a control-D to exit the Bourne shell (sh(1)), and exit, logout or control-d (if ignoreeof is not set) for the C-shell, csh(1)). Certain interactive commands, such as vi(1), create garbage in the typescript file. The script utility works best with commands that do not manipulate the screen. The results are meant to emulate a hardcopy terminal, not an addressable one. ENVIRONMENT
The following environment variable is utilized by script: SHELL If the variable SHELL exists, the shell forked by script will be that shell. If SHELL is not set, the Bourne shell is assumed. (Most shells set this variable automatically). SEE ALSO
csh(1) (for the history mechanism). HISTORY
The script command appeared in 3.0BSD. BUGS
The script utility places everything in the log file, including linefeeds and backspaces. This is not what the naive user expects. It is not possible to specify a command without also naming the script file because of argument parsing compatibility issues. When running in -k mode, echo cancelling is far from ideal. The slave terminal mode is checked for ECHO mode to check when to avoid manual echo logging. This does not work when in a raw mode where the program being run is doing manual echo. BSD
June 6, 1993 BSD

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