PWCK(8)                   System Management Commands                   PWCK(8)

NAMN
       pwck - verify the integrity of password files

SYNOPSIS
       pwck [options] [PASSWORDFILE [ SHADOWFILE ]]

BESKRIVNING
       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 gors for att validera att varje post har:

       o   korrekt antal falt

       o   a unique and valid user name

       o   en giltig identifierare for anvandare och grupp

       o   en giltig primar grupp

       o   en giltig hemkatalog

       o   ett giltigt inloggningsskal

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

       These checks are the following:

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

       o   passwords are specified in the shadowed file

       o   shadow entries have the correct number of fields

       o   shadow entries are unique in shadow

       o   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 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.

FLAGGOR
       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
           Visa hjalpmeddelande 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
           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.

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

FILER
       /etc/group
           Gruppkontoinformation.

       /etc/passwd
           Anvandarkontoinformation.

       /etc/shadow
           Saker anvandarkontoinformation.

AVSLUTNINGSVARDEN
       The pwck command exits with the following values:

       0
           success

       1
           invalid command syntax

       2
           one or more bad password entries

       3
           can't open password files

       4
           can't lock password files

       5
           can't update password files

       6
           can't sort password files

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

shadow-utils 4.15.1               01-04-2024                           PWCK(8)