# cat /etc/login.defs
# *REQUIRED*
#   Directory where mailboxes reside, _or_ name of file, relative to the
#   home directory.  If you _do_ define both, MAIL_DIR takes precedence.
#   QMAIL_DIR is for Qmail
#
#QMAIL_DIR      Maildir
MAIL_DIR        /var/spool/mail
#MAIL_FILE      .mail

# Password aging controls:
#
#       PASS_MAX_DAYS   Maximum number of days a password may be used.
#       PASS_MIN_DAYS   Minimum number of days allowed between password changes.
#       PASS_MIN_LEN    Minimum acceptable password length.
#       PASS_WARN_AGE   Number of days warning given before a password expires.
#
PASS_MAX_DAYS   99999
PASS_MIN_DAYS   0
PASS_MIN_LEN    5
PASS_WARN_AGE   7

#
# Min/max values for automatic uid selection in useradd
#
UID_MIN                   500
UID_MAX                 60000

#
# Min/max values for automatic gid selection in groupadd
#
GID_MIN                   500
GID_MAX                 60000

#
# If defined, this command is run when removing a user.
# It should remove any at/cron/print jobs etc. owned by
# the user to be removed (passed as the first argument).
#
#USERDEL_CMD    /usr/sbin/userdel_local

#
# If useradd should create home directories for users by default
# On RH systems, we do. This option is overridden with the -m flag on
# useradd command line.
#
CREATE_HOME     yes

# The permission mask is initialized to this value. If not specified,
# the permission mask will be initialized to 022.
UMASK           077

# This enables userdel to remove user groups if no members exist.
#
USERGROUPS_ENAB yes

# Use MD5 or DES to encrypt password? Red Hat use MD5 by default.
MD5_CRYPT_ENAB yes

ENCRYPT_METHOD MD5

		

# cat userfile.txt
www00:x:520:520::/home/www00:/sbin/nologin
www01:x:521:521::/home/www01:/sbin/nologin
www02:x:522:522::/home/www02:/sbin/nologin
www03:x:523:523::/home/www03:/sbin/nologin
www04:x:524:524::/home/www04:/sbin/nologin
www05:x:525:525::/home/www05:/sbin/nologin
www06:x:526:526::/home/www06:/sbin/nologin
www07:x:527:527::/home/www07:/sbin/nologin
www08:x:528:528::/home/www08:/sbin/nologin
www09:x:529:529::/home/www09:/sbin/nologin

# newusers userfile.txt
		

echo "user:password" | chpasswd

[root@dev1 ~]# adduser test
[root@dev1 ~]# echo "test:123456" | chpasswd
		

# cat passwd.txt
neo:neopass
jam:jampass

# cat passwd.txt | chpasswd
		

		
#　chpasswd　-c　<　passwd.txt
		
		

passwd 命令實現相同功能

echo "mypasword" | passwd –stdin neo