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Full Discussion: Understanding the difference between individual BASH login scripts
Top Forums UNIX for Beginners Questions & Answers Understanding the difference between individual BASH login scripts Post 303006906 by apmcd47 on Thursday 9th of November 2017 04:19:46 AM
Old 11-09-2017
The profile and login files are for setting your non-volatile environment. For instance, any environment variables, such as PATH, that you export. So these variables will stay with you from shell to subshell to subshell. In the olden days, when people logged in from a terminal, commands like stty would also appear in the login files, because no matter how many subshells you start, you won't change your terminal.

The basrc/kshrc and rc files for other shells are for the volatile environment, such as functions and aliases, which don't stay with you when you start a subshell, or variables that you don't for some reason export.

Before somebody corrects me, I should say that functions can be exported in bash (and I think ksh), but they don't tend to be.

Andrew

---------- Post updated at 09:19 AM ---------- Previous update was at 09:07 AM ----------

Quote:
Originally Posted by bodisha

I looked through the profile and all the scripts under the /etc/profile.d directory and couldn't locate anything calling the /etc/bashrc script. Could I ask you for a clue on where else I might look to see what's starting it?

Thanks for your patience
From the bash man page on my Ubuntu system:
Code:
       --init-file file
       --rcfile file
              Execute commands from file instead of the system  wide  initial‐
              ization file /etc/bash.bashrc and the standard personal initial‐
              ization file ~/.bashrc if the shell is interactive (see  INVOCA‐
              TION below).

If you have /etc/bashrc it is possible that your distribution has changed the name of the default system bashrc file (or maybe Ubuntu or Debian have). But this file is read by bash by default on startup.

Andrew
 

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LEARN ABOUT LINUX

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.

       -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).

User Commands							    06/24/2011								   CHSH(1)
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