11-17-2009
You can't make /etc/passwd unreadable, because commands like "ls" rely on it to associate numeric uids to usernames.
If you make /etc/passwd unreadable to a user, then whenever that user types "ls -l", or certain other commands, they will just see numbers instead of usernames as the file owners.
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LEARN ABOUT REDHAT
lppasswd
lppasswd(1) Easy Software Products lppasswd(1)
NAME
lppasswd - add, change, or delete digest passwords.
SYNOPSIS
lppasswd [ -a ] [ -g groupname ] [ -x ] [ username ]
DESCRIPTION
lppasswd adds, changes, or deletes passwords in the CUPS digest password file, passwd.md5. When run by a normal user, lppasswd will prompt
for the old and new passwords. When run by the super-user, lppasswd can add new accounts (-a username), change existing accounts (user-
name), or delete accounts (-x username) in the digest password file. Digest usernames do not have to match local UNIX usernames, but only
UNIX usernames are supported by the CUPS client programs (lp(1), lpr(1), etc.)
The -g option specifies a group other than the system group - "sys", "system", or "root", depending on the operating system.
SECURITY ISSUES
The lppasswd command is installed setuid to root. While every attempt has been made to make it secure against exploits that could grant
super-user priviledges to unpriviledged users, paranoid system administrators may wish to disable or change the ownership of the program to
an unpriviledged account.
SEE ALSO
lp(1), lpr(1), CUPS Software Administrators Manual, CUPS Software Users Manual, http://localhost:631/documentation.html
COPYRIGHT
Copyright 1993-2002 by Easy Software Products, All Rights Reserved.
7 June 2001 Common UNIX Printing System lppasswd(1)