pwconv - phpMan

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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