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RedHat 9 (Linux i386) - man page for grpconv (redhat section 8)

PWCONV(8)			     System Manager's Manual				PWCONV(8)

NAME
       pwconv, pwunconv, grpconv, grpunconv - convert to and from shadow passwords and groups.

SYNOPSIS
       pwconv
       pwunconv
       grpconv
       grpunconv

DESCRIPTION
       These  four  programs  all  operate  on	the  normal  and shadow password and group files:
       /etc/passwd, /etc/group, /etc/shadow, and /etc/gshadow.

       pwconv creates shadow from passwd and an optionally  existing  shadow.	pwunconv  creates
       passwd from passwd and shadow and then removes shadow.  grpconv creates gshadow from group
       and an optionally existing gshadow.  grpunconv creates group from group	and  gshadow  and
       then removes gshadow.

       Each program acquires the necessary locks before conversion.

       pwconv and grpconv are similiar.  First, entries in the shadowed file which don't exist in
       the main file are removed.  Then, shadowed entries which don't have `x' as the password in
       the main file are updated.  Any missing shadowed entries are added.  Finally, passwords in
       the main file are replaced with `x'.  These programs can be used for initial conversion as
       well to update the shadowed file if the main file is edited by hand.

       pwconv  will  use  the  values  of  PASS_MIN_DAYS,  PASS_MAX_DAYS,  and PASS_WARN_AGE from
       /etc/login.defs when adding new entries to /etc/shadow.

       Likewise, pwunconv and grpunconv are similiar.  Passwords in the  main  file  are  updated
       from the shadowed file.	Entries which exist in the main file but not in the shadowed file
       are left alone.	Finally, the shadowed file is removed.

       Some password aging information is lost by pwunconv.  It will convert what it can.

BUGS
       Errors in the password or group files (such as invalid or  duplicate  entries)  may  cause
       these  programs	to loop forever or fail in other strange ways.	Please run pwck and grpck
       to correct any such errors before converting to or from shadow passwords or groups.

SEE ALSO
       login.defs(5), grpck(8), pwck(8)

					   26 Sep 1997					PWCONV(8)


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