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Shell Programming and Scripting
How to get environment of a "fresh" login shell?
Post 302243315 by Miikka on Saturday 4th of October 2008 05:31:59 PM
10-04-2008
You are correct, however, that is how its currently done as I mentioned in my first post:
The problem is that users would like to source those environment setting scripts directly from a shell without "start a new shell - source a script - do some stuff - exit the shell - start a new shell" cycle. So they just want to "source a script - do some stuff - source a new script - do some other stuff".
So what I'm trying to accomplish here is some sort of way to make those environment setting scripts to reset the environment back to what it was at the time of login and then applying new settings. One thing to notice also is that I cannot force users to modify their .profile to save the environment at login time.
I was hoping there would be some kind of way to use rlogin (or something else giving the same result) to get a clean login shell so that I could do the following in the beginning of each script setting an environment:
* rlogin to a new shell which does not inherit the environment of parent
* at rlogin shell: env > clean_env.txt
* at script which is sourced:
** remove all environment variables and source clean_env.txt
** add some new environment variables on top of that
I know I could do this with Java or C, but I really would like to stick with shell script/perl/awk...
Sorry if I haven't been clear enough with my question
Quote:
Currently, there are two ways of doing this:
a) start a new terminal each time a new environment should be taken into use
b) before sourcing, start a new shell, e.g. bash/csh/what ever, and then do the sourcing... And when done -> exit that shell to get back the login shell and then start a new shell again
a) start a new terminal each time a new environment should be taken into use
b) before sourcing, start a new shell, e.g. bash/csh/what ever, and then do the sourcing... And when done -> exit that shell to get back the login shell and then start a new shell again
So what I'm trying to accomplish here is some sort of way to make those environment setting scripts to reset the environment back to what it was at the time of login and then applying new settings. One thing to notice also is that I cannot force users to modify their .profile to save the environment at login time.
I was hoping there would be some kind of way to use rlogin (or something else giving the same result) to get a clean login shell so that I could do the following in the beginning of each script setting an environment:
* rlogin to a new shell which does not inherit the environment of parent
* at rlogin shell: env > clean_env.txt
* at script which is sourced:
** remove all environment variables and source clean_env.txt
** add some new environment variables on top of that
I know I could do this with Java or C, but I really would like to stick with shell script/perl/awk...
Sorry if I haven't been clear enough with my question
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LEARN ABOUT DEBIAN
chsh
CHSH(1) User Commands CHSH(1) NAME
chsh - change login shell SYNOPSIS
chsh [options] [LOGIN] DESCRIPTION
The chsh command changes the user login shell. This determines the name of the user's initial login command. A normal user may only change the login shell for her own account; the superuser may change the login shell for any account. OPTIONS
The options which apply to the chsh command are: -h, --help Display help message and exit. -R, --root CHROOT_DIR Apply changes in the CHROOT_DIR directory and use the configuration files from the CHROOT_DIR directory. -s, --shell SHELL The name of the user's new login shell. Setting this field to blank causes the system to select the default login shell. If the -s option is not selected, chsh operates in an interactive fashion, prompting the user with the current login shell. Enter the new value to change the shell, or leave the line blank to use the current one. The current shell is displayed between a pair of [ ] marks. NOTE
The only restriction placed on the login shell is that the command name must be listed in /etc/shells, unless the invoker is the superuser, and then any value may be added. An account with a restricted login shell may not change her login shell. For this reason, placing /bin/rsh in /etc/shells is discouraged since accidentally changing to a restricted shell would prevent the user from ever changing her login shell back to its original value. FILES
/etc/passwd User account information. /etc/shells List of valid login shells. /etc/login.defs Shadow password suite configuration. SEE ALSO
chfn(1), login.defs(5), passwd(5). shadow-utils 4.1.5.1 05/25/2012 CHSH(1)