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Full Discussion: environment variable
Top Forums Shell Programming and Scripting environment variable Post 302121042 by jim mcnamara on Monday 11th of June 2007 11:21:18 AM
Old 06-11-2007
Unless I'm making a lot of bad assumptions, you are making this far harder than it needs to be.

These variables have to be defined for something (not everything) to work for some users, at least some of the time, and under different shells. It has to be invoked on demand, otherwise it is not in effect. You did not specify that the environment has to go away after the user decides to stop using it. :: Your requirments definition.

Possible solutions:

1. create a shell-aware driver script to run the correct version of script needed.

2. Create two different versions of the script to run under csh, ksh. Teach the users what to do - which command sets variables for what shell.

3. define a function(s) that the user executes when he/she wants to set the variables.

4. Create a special account(s) on the system to handle this one environment.
This is very common - ftp/sftp accounts are an example.

5. create a script that is the ONLY way to enter the environment. The script takes over being the environment. This is commonly done to restrict users and is often written in perl or python. When the user exits the environment goes away of course.

If one of these does not meet your needs, you are going to have to explicitly define all your requirements up front.
 

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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 environment as possible, removing most environment variables and with 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 it 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 command. service --status-all runs all init scripts, in alphabetical order, with the status command. If the init script file does not exist, the script tries to use legacy actions. If there is no suitable legacy action found and COMMAND is one of actions specified in LSB Core Specification, input is redirected to the systemctl. Otherwise the command fails with return code 2. 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
chkconfig(8), ntsysv(8), systemd(1), systemctl(8), systemd.service(5) Jan 2006 service(8)
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