pwck

NAME

pwck - verify the integrity of password files

ÜBERSICHT

pwck [Optionen] [ PASSWORDFILE [ SHADOWFILE ]]

The pwck command verifies the integrity of the users and authentication information. It checks that all entries in /etc/passwd and /etc/shadow have the proper format and contain valid data. The user is prompted to delete entries that are improperly formatted or which have other uncorrectable errors.

Es wird überprüft, ob jeder Eintrag folgende Eigenschaften aufweist:

•die richtige Anzahl von Feldern

•einen eindeutigen und gültigen Benutzernamen

•eine gültige Benutzer- und Gruppenkennung

•eine gültige Hauptgruppe

•ein gültiges Home-Verzeichnis

•eine gültige Anmelde-Shell

Checks for shadowed password information are enabled when the second file parameter SHADOWFILE is specified or when /etc/shadow exists on the system.

Diese Tests umfassen Folgendes:

•ob jedem Eintrag in passwd ein Eintrag in shadow entspricht und umgekehrt

•ob die Passwörter in der Shadow-Datei niedergelegt sind

•ob die shadow-Einträge die richtige Anzahl von Feldern haben

•ob die Shadow-Einträge in shadow eindeutig sind

•dass das Datum der letzten Passwortänderung nicht in der Zukunft liegt

The checks for correct number of fields and unique user name are fatal. If the entry has the wrong number of fields, the user will be prompted to delete the entire line. If the user does not answer affirmatively, all further checks are bypassed. An entry with a duplicated user name is prompted for deletion, but the remaining checks will still be made. All other errors are warnings and the user is encouraged to run the usermod command to correct the error.

The commands which operate on the /etc/passwd file are not able to alter corrupted or duplicated entries. pwck should be used in those circumstances to remove the offending entry.

OPTIONEN

The -r and -s options cannot be combined.

The options which apply to the pwck command are:

--badname

Allow names that do not conform to standards.

-h, --help

zeigt die Hilfe an und beendet das Programm

-q, --quiet

meldet nur Fehler. Warnungen, die keine Handlung des Benutzers erfordern, werden nicht angezeigt

-r, --read-only

Execute the pwck command in read-only mode.

-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.

-s, --sort

Sort entries in /etc/passwd and /etc/shadow by UID.

By default, pwck operates on the files /etc/passwd and /etc/shadow. The user may select alternate files with the passwd and shadow parameters.