Provided by:
passwd_4.0.18.2-1ubuntu2_i386 
NAZWA
pwck - verify integrity of password files
SKŁADNIA
pwck [-q] [-s] [passwd shadow]
pwck [-q] [-r] [passwd shadow]
OPIS
The pwck command verifies the integrity of the system authentication
information. All entries in the /etc/passwd and /etc/shadow are checked
to see that the entry has the proper format and valid data in each
field. The user is prompted to delete entries that are improperly
formatted or which have other uncorrectable errors.
Checks are made to verify that each entry has:
o the correct number of fields
o a unique user name
o a valid user and group identifier
o a valid primary group
o a valid home directory
o a valid login shell
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.
OPCJE
Polecenie pwck posiada następujące opcje:
-q
Report errors only. The warnings which do not require any action
from the user won't be displayed.
-r
Execute the pwck command in read-only mode.
-s
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.
PLIKI
/etc/group
Informacje o grupach użytkowników.
/etc/passwd
Informacja o kontach użytkowników.
/etc/shadow
Informacje chronione o użytkownikach.
ZOBACZ TAKŻE
group(5), passwd(5), shadow(5), usermod(8).
KOD ZAKOŃCZENIA
Polecenie pwck kończy działanie z następującymi wartościami kodów
zakończenia:
0
poprawne zakończenie działania programu
1
niepoprawna składnia polecenia
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