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Full Discussion: Setting Variables not working
Operating Systems AIX Setting Variables not working Post 73860 by bakunin on Monday 6th of June 2005 07:16:44 AM
Old 06-06-2005
The reason is that the script is executed not in *your* environment, but in an environment *of its own*. This environment of the script inherits every variable of your environment, but every changes made inside it will be lost upon destruction of this environment - which happens when the script ends.

To execute the script in your own environment use the "." command:

# ./myscript

will execute the script in its own environment, but:

# . ./myscript

will execute it in your environment.

This mechanism is usually used to set up your initial environment. Look at your ~/.profile file and you might eventually notice a line reading ". ~/.kshrc". This is using this mechanism to "source in" (as the correct phrase is) the content of your Korn-shell rc-file to your environment. Usually .kshrc consists of variable declarations, (useful) function definitions, etc.

bakunin
 

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LEARN ABOUT LINUX

service

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.

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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