環境
RedHat Linux 9 + VWWare 7.1.2 + Putty 0.62
問題
Linux更改用戶密碼
解決
方法一
1.如果你是以普通用戶登錄的話，修改自己的密碼，使用passwd命令。會讓你先輸入自己的舊密碼，再輸入兩遍新密碼。
[www.linuxidc.com@localhost root]$ passwd
Changing password for user wgb.
Changing password for wgb
(current) UNIX password:
New password:
Retype new password:
passwd: all authentication tokens updated successfully.
[www.linuxidc.com@localhost root]$
[www.linuxidc.com@localhost root]$ passwd wgb
passwd: Only root can specify a user name.
2.如果你是root用戶登錄的話，使用passwd root或者passwd，就可以修改root的密碼。直接輸入兩遍新密碼就可以了，不用輸入舊密碼。
[root@localhost root]# passwd
Changing password for user root.
New password:
BAD PASSWORD: it is too short
Retype new password:
passwd: all authentication tokens updated successfully.
[root@localhost root]#
[root@localhost root]# passwd root
Changing password for user root.
New password:
BAD PASSWORD: it is too short
Retype new password:
passwd: all authentication tokens updated successfully.
[root@localhost root]#
方法二
root用戶登錄，打開終端，執行 echo "你想設置的密碼" | passwd --stdin 用戶名
[root@localhost root]# echo "wgb" | passwd --stdin wgb
Changing password for user wgb.
passwd: all authentication tokens updated successfully.
