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Full Discussion: .bashrc in Ubuntu 14.04
Operating Systems Linux Fedora .bashrc in Ubuntu 14.04 Post 302958411 by bakunin on Thursday 22nd of October 2015 01:00:45 AM
Old 10-22-2015
@MadeInGermany: good question! My answer is a firm: that depends. ;-))

As i said earlier, .profile is executed once for every login(-shell), .rc-files (depending on the login shell ~/.kshrc or ~/.bashrc or even something else) are executed for every new shell. Whatever you want to execute every time you log in goes to the profile, whatever you want executed for every new shell goes to the rc-file.

Quote:
Originally Posted by MadeInGermany
As pointed out earlier,
Code:
PATH=${PATH}:/dir/to/add

in .bashrc can end up in multiple :/dir/to/add:/dir/to/add:..., because each nested shell runs another .bashrc at start-up.
True. In some environments i put a sort-of "reentrancy-protection" into my .kshrc to prevent that:

Code:
if [ "$NEVER_USE_THIS_VAR" = "" ] ; then
     PATH="$PATH:/dir/to/add"
     ....
     typeset -x NEVER_USE_THIS_VAR="Kilroy was here."
fi

But i have to say that nested shells happen rarely at my workplace. My typical environment consists of an X-server, mwm on top and many xterms. The login session starts the window manager via exec, so the shells in the xterms are each first-level shells because the login-process was replaced by the mwm.

I do not use "desktops" like KDE, GNOME or whatever they are called if i can avoid it, so i can say nothing about how these work.

bakunin
 

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LEARN ABOUT XFREE86

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 4.5                                                    01/25/2018                                                             CHSH(1)
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