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Possible Duplicate:
Differences between /usr/bin/login and /usr/bin/bash

What is the difference between /usr/bin/login, and /usr/bin/bash? Does the first command something more, or different from what done from the second command?
Is there any reason to choose the first as default shell?

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migrated from Jun 29 '10 at 2:58

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marked as duplicate by Ignacio Vazquez-Abrams, akira, Ivo Flipse Jun 29 '10 at 6:36

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Some people don't want to use bash as their default shell. – Anon. Jun 29 '10 at 2:35
Those people should be found and re-educated :-) – paxdiablo Jun 29 '10 at 2:41
@paxdiablo - what's wrong with using a program that can't be used as a shell at all due to not being a command line interpreter as ones default shell? :) – DVK Jun 29 '10 at 3:08
@paxdiablo - on a serious note, people might just prefer tcsh, for example (for a variety of logical and good or sometimes sentimental and subjective reasons). – DVK Jun 29 '10 at 3:08
up vote 3 down vote accepted

They are two very different things, and only commonality is that both usually run at the beginning of loggin in a user and both run a configuration dot-file (.login and .bashrc) that are essencially shell scripts. In addition bash, like many modern shells, also allows you to switch between users, which is one of the main purposes of login

In detail:

login is a program used to log in a user, at the end of which the shell (aka command line interpreter) is executed.

login only knows how to do one thing - log in a user (athenticate using username/password, set some environmental variables like TERM and PATH, and execute a couple of on-login admin tasks - see the link for details.

A unix shell (of which bash is an example of) is a command line interpreter coupled with a script interpreter, and its function is to accept input (from the user or supplied programmatically) and execute requested commands.

As far as I'm aware, login can not be used as a shell at all as it has no functionality of a command line interpreter.

share|improve this answer has the setting "Shells open with:" with the option "Default login shell (/usr/bin/login)", and "Command (complete path)" that by default contains "/usr/bin/bash". – kiamlaluno Jun 29 '10 at 8:48

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