Sponsored Content
Full Discussion: Environment variables
Top Forums Shell Programming and Scripting Environment variables Post 302631095 by rwa25 on Thursday 26th of April 2012 07:02:51 PM
Old 04-26-2012
Environment variables

I have read tons of posts about how you can't set persisting environment variable in a child script of a shell and have it persist. The only way is to source a file as

% . <scriptname>

I am finding that true... but I know there is a way around it. I just don't know how. I worked for 6 years at a company where you would set a bunch of environment variables that defined your work space with various tools. They were all very simple to use ex.:

% toolname argument
% echo $envVarFoo
% Bar

These variable drove everything about what directory you were in, how other tools behaved, and where your files were written to and read from. And there was nothing hacky/tricky for the user.

Shame on me for not better examining the tools, though they were extremely complicated. I do know they are made up of some Perl and Python mostly. I am writing a sweet of tools now to do various things. One thing I need to be able to do is set environment variables that don't die with the script. Can someone please point me in the right direction?! I know we didn't litter our system with hidden dot files either.

Begging for Help!
 

10 More Discussions You Might Find Interesting

1. UNIX for Dummies Questions & Answers

what is the use of Environment variables

what is the actual use of environment variables. I know only PS1, LOGNAME, PS2 variables what are the other variables & what is there use (2 Replies)
Discussion started by: indianguru
2 Replies

2. Programming

environment variables

Hi! How-to get the environment variables in GNU. getenv() only fetches the ones that you can find under export (not the ones under declare)... best regars .David (2 Replies)
Discussion started by: Esaia
2 Replies

3. UNIX for Dummies Questions & Answers

environment variables

Hi Folks, Is it possible somehow to unset all the environment variables which have been defined before in UNIX (Solaris). Thanks, Slava (3 Replies)
Discussion started by: spavlov
3 Replies

4. UNIX for Dummies Questions & Answers

help..Environment variables...

hi, 1). i would like to know what is meant by environment variables? 2). is the number of envi variables is a constant number for unix systems? 3). how to see the list of envi variables (and the values of the envi variables)in a single command? 4). if this questions were already asked... (3 Replies)
Discussion started by: sekar sundaram
3 Replies

5. Programming

environment variables

hi, I want to create a new EV(Environment Variable) through a c program and I done this thing through setenv() method. But the newly created EV is not permanent, i.e. when I exit from the program the EV also no longer lives. But I want to make it a permanent EV for the current user. Actually I... (6 Replies)
Discussion started by: sumsin
6 Replies

6. Shell Programming and Scripting

environment variables

Hi, If i have a variable set and exported in my pofile file will that variable be available in all shell scripts created. Thanks, Radhika. (3 Replies)
Discussion started by: radhika03
3 Replies

7. UNIX for Dummies Questions & Answers

Environment variables

why are all environment variables represented in a fixed format regardless of the shell you use? like $HOME $PATH etc (6 Replies)
Discussion started by: sravani
6 Replies

8. HP-UX

Environment Variables

Hi Experts, Need your help in understanding the commands to setup the environment variables in hp-ux. Beleive need to use either set,setenv or export. I am confused between above three options, when to use which option? On command line, I have tried both set and setenv but couldn't... (1 Reply)
Discussion started by: sai_2507
1 Replies

9. Homework & Coursework Questions

Environment Variables

1. The problem statement: What is the mesg value set for your environment? If it is on, how would you turn off your current session? How would you set it permanently? 3. The attempts at a solution : Read Unix The textbook. 3rd chapter has many things like environment variables and... (5 Replies)
Discussion started by: mahinkhan22
5 Replies

10. HP-UX

Environment Variables

Hi All, I need to understand following three environment variables and their usages in HP Unix. _M_ARENA_OPTS _M_CACHE_OPTS PTHREAD_SCOPE_SYSTEM How does these environment variables influence multi threaded applciation and how do we decide the value of these variables? Is there... (0 Replies)
Discussion started by: angshuman
0 Replies
ENVSTORE(1)						    BSD General Commands Manual 					       ENVSTORE(1)

NAME
envstore -- save and restore environment variables SYNOPSIS
envstore command [args ...] DESCRIPTION
envstore can save and restore environment variables, thus transferring them between different shells. command must be one of clear Forget all stored variables eval Produce shell code for evaluation, restoring all saved variables list List saved variables in better readable format save variable [value] Save variable either with its current shell value or with value rm variable Remove variable from store Note: Only the first character of command is checked, so envstore e instead of envstore eval, envstore c for envstore clear, etc., are also valid. ENVIRONMENT
ENVSTORE_FILE The file in which the environment parameters are stored, /tmp/envstore-EUID by default, LIMITATIONS
Variable names or values must not contain null bytes or newlines. Due to limitations imposed by most shells, it is not possible to save parameters containing more than one consecutive whitespace. envstore will save and display them correctly, but unless you do IFS trickery, your shell will not be able to load them. The current maximum length (in bytes) is 255 bytes for the variable name and 1023 bytes for its content. AUTHOR
envstore was written by Daniel Friesel <derf@derf.homelinux.org>. Original idea and script by Maximilian Gass <mxey@ghosthacking.net>. SEE ALSO
envify(1) BSD
December 1, 2009 BSD
All times are GMT -4. The time now is 11:17 PM.
Unix & Linux Forums Content Copyright 1993-2022. All Rights Reserved.
Privacy Policy