Ignore variables from another shell

Question

I am on a linux workstation in a network, with an "old" distrib. Furthermore, login shell is enforced to CSH. I already asked to Admins if it would be possible to switch to another one (I would like to have bash), but it was a no-go...

Therefore, I am running bash from the command line, as an interactive non-login shell (actually I am using gnome and gnome-terminal with a profile that runs /bin/bash -i as the command). A lot, if not all of my scripts use bash so I run them from it invoking bash with a script. It is messy but it works.

I have .cshrc with environment variables, aliases and options for csh defined in a .login and a .cshrc files in my $HOME. I also have a .bashrc/.bash_profile(that redirects to .bashrc if this an interactive shell)/.bash_aliases with some other variables and some that are the same. When I run the bash shell, I inherit from the environments variables defined in my .login file. I would like to ignore everything that is set up in this one when I run bash.

I would like to know if there is an option to run bash, ignoring every other environment variables previously defined from my CSH login session when I run my BASH shell.

Do you have any ideas?

Thank you

Answer 1

Instead of manually unsetting variables you don't want to inherit, run bash using the env command:

env -i bash

The -i flag causes bash to ignore its inherited environment.

Answer 2

You want to run bash as non-interactive shell, inside CSH, with bash variables defined in .bash_profile right?

You could give a shoot:

./bash --login
source ./bash --login

but i can't test it.