Support for shadow passwords has been enhanced significantly for Red Hat Linux
5.2. Shadow passwords are a method of improving system security by
moving the encrypted passwords (normally found in /etc/passwd) to
another file with more restrictive file access permissions. The
shadow-utils package contains a number of utilities that support:
- Conversion from normal to shadowed passwords and back (pwconv,
- Verification of the password, group, and associated shadow files
- Industry-standard methods of adding, deleting and modifying user
usermod, and userdel).
- Industry-standard methods of adding, deleting, and modifying user
groupmod, and groupdel).
- Industry-standard method of administering the /etc/group file
Please Note: There are a few additional points of interest concerning these
- The utilities will work properly whether shadowing is enabled or not.
- The utilities have been slightly modified to support Red Hat Software's user
private group scheme. For a description of the modifications, please see
the useradd man page. For more information on user private groups,
please turn to Section 11.3.3.
- The adduser script has been replaced with a symlink to