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Full Discussion: Please what are shells?
Top Forums UNIX for Dummies Questions & Answers Please what are shells? Post 302894430 by Perderabo on Tuesday 25th of March 2014 12:28:38 PM
Old 03-25-2014
These are linux (and other unix versions) based systems that are on the Internet and offer free shell accounts. So you can (I guess) ssh to them, login, and get a shell prompt. If you had no other linux system, this is a way to access one to learn about it.

You are currently on a linux system. But you cannot ssh to it and get a shell prompt. Only the admins, Neo and Scott can do that.
 

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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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