PWCK(8)                    Systemhanteringskommandon                   PWCK(8)

       pwck - validera integriteten för lösenordsfiler

       pwck [flaggor] [passwd [ shadow ]]

       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.

       Kontroller görs för att validera att varje post har:

       ·   korrekt antal fält

       ·   a unique and valid user name

       ·   en giltig identifierare för användare och grupp

       ·   en giltig primär grupp

       ·   en giltig hemkatalog

       ·   ett giltigt inloggningsskal

       shadow checks are enabled when a second file parameter is specified or
       when /etc/shadow exists on the system.

       These checks are the following:

       ·   every passwd entry has a matching shadow entry, and every shadow
           entry has a matching passwd entry

       ·   passwords are specified in the shadowed file

       ·   shadow entries have the correct number of fields

       ·   shadow entries are unique in shadow

       ·   the last password changes are not in the future

       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 warning 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.

       The -r and -s options cannot be combined.

       Flaggorna som gäller för kommandot pwck är:

       -h, --help
           Visa hjälpmeddelande och avsluta.

       -q, --quiet
           Report errors only. The warnings which do not require any action
           from the user won't be displayed.

       -r, --read-only
           Starta kommandot pwck i skrivskyddat läge.

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

       -s, --sort
           Sorterar poster i /etc/passwd och /etc/shadow efter 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.

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

       PASS_MAX_DAYS (number)
           The maximum number of days a password may be used. If the password
           is older than this, a password change will be forced. If not
           specified, -1 will be assumed (which disables the restriction).

       PASS_MIN_DAYS (number)
           The minimum number of days allowed between password changes. Any
           password changes attempted sooner than this will be rejected. If
           not specified, -1 will be assumed (which disables the restriction).

       PASS_WARN_AGE (number)
           The number of days warning given before a password expires. A zero
           means warning is given only upon the day of expiration, a negative
           value means no warning is given. If not specified, no warning will
           be provided.



           Säker användarkontoinformation.

       Kommandot pwck avslutas med följande värden:


           ogiltig kommandosyntax

           en eller flera felaktiga lösenordsposter

           kan inte öppna lösenordsfiler

           kan inte låsa lösenordsfiler

           kan inte uppdatera lösenordsfiler

           can't sort password files

       group(5), grpck(8), passwd(5), shadow(5), usermod(8).

shadow-utils 4.7                  13-11-2019                           PWCK(8)