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Full Discussion: why we have different shells?
Top Forums UNIX for Advanced & Expert Users why we have different shells? Post 302269066 by melias on Tuesday 16th of December 2008 07:33:59 PM
Old 12-16-2008
The main difference between BSD and SVR flavours is in the way startup scripts are executed.

The different shells all perform in slightly different ways. Some differ in the way variables are dealt with. The shells were all written by different people, and each developer included their own special functions, etc, depending on what they thought was required. The different shells all have their strong and weak points, but there's not enough room here to list them all.

Search the web for info on the shells you're interested in to see what features each shell provides (or doesn't).
 

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LEARN ABOUT CENTOS

chsh

CHSH(1) 							   User Commands							   CHSH(1)

NAME

       chsh - change your login shell

SYNOPSIS

       chsh [-s shell] [-l] [-u] [-v] [username]

DESCRIPTION

       chsh is used to change your login shell.  If a shell is not given on the command line, chsh prompts for one.

       chsh is used to change local entries only. Use ypchsh, lchsh or any other implementation for non-local entries.

OPTIONS

       -s, --shell shell
	      Specify your login shell.

       -l, --list-shells
	      Print the list of shells listed in /etc/shells and exit.

       -u, --help
	      Print a usage message and exit.

       -v, --version
	      Print version information and exit.

VALID SHELLS

       chsh  will  accept  the full pathname of any executable file on the system.  However, it will issue a warning if the shell is not listed in
       the /etc/shells file.  On the other hand, it can also be configured such that it will only accept shells listed in this	file,  unless  you
       are root.

EXIT STATUS

       Returns 0 if operation was successful, 1 if operation failed or command syntax was not valid.

SEE ALSO

       login(1), passwd(5), shells(5)

AUTHOR

       Salvatore Valente <svalente@mit.edu>

AVAILABILITY

       The chsh command is part of the util-linux package and is available from ftp://ftp.kernel.org/pub/linux/utils/util-linux/.

util-linux							     July 2009								   CHSH(1)
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