LIUNIX批量修改密码命令

命令：chpasswd

NAME
       chpasswd - update password file in batch

SYNOPSIS
       chpasswd [-e]

DESCRIPTION
       chpasswd  reads  a  file  of user name and password pairs from standard input and uses this information to update a
       group of existing users. Without the -e switch, the passwords are expected to be cleartext. With the -e switch, the
       passwords are expected to be in encrypted form.  Each line is of the format

              user_name:password

       The  named user must exist.  The supplied password will be encrypted as necessary, and the password age updated, if
       present.

       This command is intended to be used in a large system environment where many accounts are created at a single time.

CAVEATS
       The input file must be protected if it contains unencrypted passwords.

执行方法：
先创建用户密码对应文件，格式为username:password，如abc:abc123,保存成文本文件ab.txt.
执行命令:chpasswd