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Top Forums Shell Programming and Scripting How to get environment of a "fresh" login shell? Post 302243268 by Miikka on Saturday 4th of October 2008 01:59:12 PM
Old 10-04-2008
Question How to get environment of a "fresh" login shell?

Hello fellow *nix users!

I am a bit confused how could I get an environment of a "fresh/clean" login shell, that is, the environment at that moment when user has started e.g. a new terminal/console or so.

So this is the sequence of actions I should be able to do in a single shell session:

1. open a new terminal
2. source a script which will set my environment based on some rule set
3. do my tasks in that environment
4. clean the environment from exports made in step #2
5. source a new script which will do some other environment exports based on some other rule set
6. do some stuff...
And this sequence goes on and on...

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

The problem with both ways mentioned above is lazy users. They would like to source the script setting the environment and after finished with that, source a new environment setting script. So they don't want to start a new shell or open up a new terminal.

So this is why I'm looking for a solution how to get an environment of a clean login shell. I don't think (might be wrong here..) there is a way to do something like:
Code:
bash -clean_shell_please "env > /tmp/some_file.txt"

Rsh does not help either as it seems to inherit its parent's environment as well. Rlogin seems like a good option BUT how can I get the environment via rlogin without user interaction, e.g. somehow piping commands to rlogin session?

Any ideas are highly appreciated! Thanks in advance!


-Miikka
 

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OPENVT(1)							     Linux 1.x								 OPENVT(1)

NAME
openvt - start a program on a new virtual terminal (VT). SYNOPSIS
openvt [-c vtnumber] [-s] [-u] [-l] [-v] [--] command command_options DESCRIPTION
openvt will find the first available VT, and run on it the given command with the given command options, standard input, output and error are directed to that terminal. The current search path ($PATH) is used to find the requested command. If no command is specified then the environment variable $SHELL is used. OPTIONS -c vtnumber Use the given VT number and not the first available. Note you must have write access to the supplied VT for this to work. -f Force opening a VT without checking whether it is already in use. -e Directly execute the given command, without forking. This option is meant for use in /etc/inittab. If you want to use this feature in another context, be aware that openvt has to be a session leader in order for -e to work. See setsid(2) or setsid(1) on how to achieve this. -s Switch to the new VT when starting the command. The VT of the new command will be made the new current VT. -u Figure out the owner of the current VT, and run login as that user. Suitable to be called by init. Shouldn't be used with -c or -l. -l Make the command a login shell. A - is prepended to the name of the command to be executed. -v Be a bit more verbose. -w wait for command to complete. If -w and -s are used together then openvt will switch back to the controlling terminal when the com- mand completes. -- end of options to openvt. NOTE
If openvt is compiled with a POSIX (GNU) getopt() and you wish to set options to the command to be run, then you must supply the end of options -- flag before the command. EXAMPLES
openvt can be used to start a shell on the next free VT, by using the command: openvt bash To start the shell as a login shell, use: openvt -l bash To get a long listing you must supply the -- separator: openvt -- ls -l HISTORY
Earlier, openvt was called open. It was written by Jon Tombs <jon@gtex02.us.es or jon@robots.ox.ac.uk>. The -w idea is from "sam". SEE ALSO
chvt(1), doshell(8), login(1) 19 Jul 1996 V1.4 OPENVT(1)
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