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Linux 2.6 - man page for chsh (linux section 1)

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CHSH(1) 				  User Commands 				  CHSH(1)

       chsh - change login shell

       chsh [options] [LOGIN]

       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.

       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 [ ]

       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

	   User account information.

	   List of valid login shells.

	   Shadow password suite configuration.

       chfn(1), login.defs(5), passwd(5).

User Commands				    06/24/2011					  CHSH(1)
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