grpunconv



PWCONV(8)                         26 Sep 1997                        PWCONV(8)




NAME

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


SYNOPSIS

       pwconv

       pwunconv

       grpconv

       grpunconv


DESCRIPTION

       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.

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

       Each program acquires the necessary locks before conversion.  pwconv
       and grpconv are similar. 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 similar. 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                       26 Sep 1997                        PWCONV(8)

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