# 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 命令实现相同功能

				echo "mypasword" | passwd –stdin neo
			

			
sudo apt install -y sshpass

root@ubuntu:~# sshpass -v
Usage: sshpass [-f|-d|-p|-e] [-hV] command parameters
   -f filename   Take password to use from file
   -d number     Use number as file descriptor for getting password
   -p password   Provide password as argument (security unwise)
   -e            Password is passed as env-var "SSHPASS"
   With no parameters - password will be taken from stdin

   -P prompt     Which string should sshpass search for to detect a password prompt
   -v            Be verbose about what you're doing
   -h            Show help (this screen)
   -V            Print version information
At most one of -f, -d, -p or -e should be used
			
			

			
sshpass -p Password scp target/*.jar root@dev.netkiller.cn:/root/		
			
			

			
sshpass -p Password ssh root@dev.netkiller.cn java -jar /root/java-0.0.1-SNAPSHOT.jar		
			
			

			
# ssh neo@192.168.6.1
The authenticity of host '192.168.6.1 (192.168.6.1)' can't be established.
RSA key fingerprint is c9:97:95:2a:5c:6a:2f:ac:e8:ac:94:24:b0:5c:45:8a.
Are you sure you want to continue connecting (yes/no)? yes
Warning: Permanently added '192.168.6.1' (RSA) to the list of known hosts.
neo@192.168.6.1's password: 

[root@centos6]~# sshpass -p 'chen' ssh neo@192.168.6.1
Last login: Wed Nov 13 15:24:50 2013
[neo@NEO ~]$