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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 SUNOS

userdel

userdel(1M)						  System Administration Commands					       userdel(1M)

NAME

       userdel - delete a user's login from the system

SYNOPSIS

       userdel [-r] login

DESCRIPTION

       The  userdel  utility  deletes a user account from the system and makes the appropriate account-related changes to the system file and file
       system.

OPTIONS

       The following options are supported:

       -r	Remove the user's home directory from the system. This directory must exist. The files and directories under  the  home  directory
		will no longer be accessible following successful execution of the command.

OPERANDS

       The following operands are supported:

       login	An existing login name to be deleted.

EXIT STATUS

       The following exit values are returned:

       0	Successful completion.

       2	Invalid command syntax. A usage message for the userdel command is displayed.

       6	The account to be removed does not exist.

       8	The account to be removed is in use.

       10	Cannot update the /etc/group or /etc/user_attr file but the login is removed from the /etc/passwd file.

       12	Cannot remove or otherwise modify the home directory.

FILES

       /etc/passwd	       system password file

       /etc/shadow	       system file contain users' encrypted passwords and related information

       /etc/group	       system file containing group definitions

       /etc/user_attr	       system file containing additional user attributes

ATTRIBUTES

       See attributes(5) for descriptions of the following attributes:

       +-----------------------------+-----------------------------+
       |      ATTRIBUTE TYPE	     |	    ATTRIBUTE VALUE	   |
       +-----------------------------+-----------------------------+
       |Availability		     |SUNWcsu			   |
       +-----------------------------+-----------------------------+

SEE ALSO

       auths(1),  passwd(1),  profiles(1),  roles(1),  users(1B),  groupadd(1M), groupdel(1M), groupmod(1M), logins(1M), roleadd(1M), rolemod(1M),
       useradd(1M), userdel(1M), usermod(1M), passwd(4), prof_attr(4), user_attr(4), attributes(5)

NOTES

       The userdel utility only deletes an account definition that is in the local /etc/group, /etc/passwd, /etc/shadow, and /etc/user_attr  file.
       file. If a network name service such as NIS or NIS+ is being used to supplement the local /etc/passwd file with additional entries, userdel
       cannot change information supplied by the network name service.

SunOS 5.10							    8 Sep 1999							       userdel(1M)
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