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Full Discussion: Change directory command (cd)
Top Forums Shell Programming and Scripting Change directory command (cd) Post 26776 by Perderabo on Friday 23rd of August 2002 08:30:23 AM
Old 08-23-2002
Changing the permissions on system directories, (especially /) will screw up your system very fast.

Many unix commands depend on system directories being accessable. Unix is not intended to have system directories locked away from users.

The only time that I have done this was to establish a super limited account for communications engineers to use to prove that our system was accessable. They could log in and run the echo command. And they could ise "exit" to log off. And that was it. If you want an account that tight, you can use chroot. But it won't be able to do much else.

Also, whenever people want something like this, they seem to focus on the cd command.

Doing something like:
cd /etc
cat passwd

is not very much different from:
cat /etc/passwd
 

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LEARN ABOUT DEBIAN

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.

       -R, --root CHROOT_DIR
	   Apply changes in the CHROOT_DIR directory and use the configuration files from the CHROOT_DIR directory.

       -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).

shadow-utils 4.1.5.1						    05/25/2012								   CHSH(1)
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