Provided by:
passwd_4.1.4.2+svn3283-3ubuntu5_i386 
NAZWA
chpasswd - wsadowa aktualizacja hasel uytkownikow
STRESZCZENIE
chpasswd [opcje]
OPIS
Polecenie chpasswd czyta pary danych (uytkownik i haslo) ze
standardowego wejcia. Odczytane informacje wykorzystywane s do
aktualizacji danych o grupie istniejcych uytkownikow. Kady wiersz
przekazywanych danych ma posta:
nazwa_uytkownika:has/lo
By default the passwords must be supplied in clear-text, and are
encrypted by chpasswd. Also the password age will be updated, if
present.
By default, passwords are encrypted by PAM, but (even if not
recommended) you can select a different encryption method with the -e,
-m, or -c options.
Except when PAM is used to encrypt the passwords, chpasswd first
updates all the passwords in memory, and then commits all the changes
to disk if no errors occured for any user.
When PAM is used to encrypt the passwords (and update the passwords in
the system database) then if a password cannot be updated chpasswd
continues updating the passwords of the next users, and will return an
error code on exit.
Polecenie to przeznaczone jest do uytku w duych systemach, gdzie
aktualizuje si wiele kont naraz.
OPCJE
Polecenie chpasswd posiada nastpujce opcje:
-c, --crypt-method METHOD
Use the specified method to encrypt the passwords.
The available methods are DES, MD5, NONE, and SHA256 or SHA512 if
your libc support these methods.
By default, PAM is used to encrypt the passwords.
-e, --encrypted
Dostarczone na standardowe wejcie hasla s traktowane jako ju
zakodowane.
-S, --stdout
Report encrypted passwords to stdout instead of updating password
file.
-h, --help
Wywietlenie komunikatu pomocy i zakoczenie dzialania.
-m, --md5
Jeeli dpostarczane hasla s w postaci jawnej uyj kodowania MD5
zamiast domylnego DES.
-s, --sha-rounds ROUNDS
Use the specified number of rounds to encrypt the passwords.
The value 0 means that the system will choose the default number of
rounds for the crypt method (5000).
A minimal value of 1000 and a maximal value of 999,999,999 will be
enforced.
You can only use this option with the SHA256 or SHA512 crypt
method.
By default, the number of rounds is defined by the
SHA_CRYPT_MIN_ROUNDS and SHA_CRYPT_MAX_ROUNDS variables in
/etc/login.defs.
OSTRZEENIA
Pamitaj eby zabezpieczy przed odczytem plik przekazywany na standardowe
wejcie polecenia.
CONFIGURATION
The following configuration variables in /etc/login.defs change the
behavior of this tool:
SHA_CRYPT_MIN_ROUNDS (number), SHA_CRYPT_MAX_ROUNDS (number)
When ENCRYPT_METHOD is set to SHA256 or SHA512, this defines the
number of SHA rounds used by the encryption algorithm by default
(when the number of rounds is not specified on the command line).
With a lot of rounds, it is more difficult to brute forcing the
password. But note also that more CPU resources will be needed to
authenticate users.
If not specified, the libc will choose the default number of rounds
(5000).
The values must be inside the 1000-999999999 range.
If only one of the SHA_CRYPT_MIN_ROUNDS or SHA_CRYPT_MAX_ROUNDS
values is set, then this value will be used.
If SHA_CRYPT_MIN_ROUNDS > SHA_CRYPT_MAX_ROUNDS, the highest value
will be used.
Note: This only affect the generation of group passwords. The
generation of user passwords is done by PAM and subject to the PAM
configuration. It is recommended to set this variable consistently
with the PAM configuration.
PLIKI
/etc/passwd
Informacja o kontach uytkownikow.
/etc/shadow
Informacje chronione o uytkownikach.
/etc/login.defs
Konfiguracja pakietu shadow.
/etc/pam.d/chpasswd
PAM configuration for chpasswd.
ZOBACZ TAKE
passwd(1), newusers(8), login.defs(5), useradd(8).