NOM

       pwconv, pwunconv, grpconv, grpunconv - Convertir vers ou depuis les fichiers de mots de passe ou de
       groupe cachés

SYNOPSIS

       pwconv [options]

       pwunconv [options]

       grpconv [options]

       grpunconv [options]

DESCRIPTION

       The pwconv command creates shadow from passwd and an optionally existing shadow.

       The pwunconv command creates passwd from passwd and shadow and then removes shadow.

       The grpconv command creates gshadow from group and an optionally existing gshadow.

       The grpunconv command 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.

OPTIONS

       The options which apply to the pwconv, pwunconv, grpconv, and grpunconv commands are:

       -h, --help
           Afficher un message d'aide et quitter.

       -R, --root CHROOT_DIR
           Apply changes in the CHROOT_DIR directory and use the configuration files from the CHROOT_DIR
           directory.

BOGUES

       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.

CONFIGURATION

       The following configuration variable in /etc/login.defs changes the behavior of grpconv and grpunconv:

       The following configuration variables in /etc/login.defs change the behavior of pwconv:

FICHIERS

       /etc/login.defs
           Configuration de la suite des mots de passe cachés « shadow password ».

VOIR AUSSI

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