|Linux & Unix Commands - Search Man Pages
pwconv, pwunconv, grpconv, grpunconv - convert to and from shadow passwords and groups.
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.
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.
login.defs(5), grpck(8), pwck(8)
26 Sep 1997 PWCONV(8)
All times are GMT -4. The time now is 07:49 AM.