PWCONV(8) Commandes de gestion du systèm PWCONV(8)
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. Only absolute paths are
supported.
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).
shadow-utils 4.13 23/03/2023 PWCONV(8)
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