CHPASSWD(8) System Management Commands CHPASSWD(8)
chpasswd - update passwords in batch mode
The chpasswd command reads a list of user name and password pairs from standard input and
uses this information to update a group of existing users. Each line is of the format:
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.
This command is intended to be used in a large system environment where many accounts are
created at a single time.
The options which apply to the chpasswd command are:
-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
By default, PAM is used to encrypt the passwords.
Supplied passwords are in encrypted form.
Report encrypted passwords to stdout instead of updating password file.
Display help message and exit.
Use MD5 encryption instead of DES when the supplied passwords are not encrypted.
-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.
Remember to set permissions or umask to prevent readability of unencrypted files by other
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.
User account information.
Secure user account information.
Shadow password suite configuration.
PAM configuration for chpasswd.
passwd(1), newusers(8), login.defs(5), useradd(8).
System Management Commands 06/24/2011 CHPASSWD(8)