Linux Operations Command (i)

Su

English Explanation: Switch User

Role: Toggles the currently logged-on user to another user.

How to use: su [-l] Username

Instance:

[[email protected] ~]# clear[[email protected] ~]# su hby[[email protected] root]$

[[email protected] root]$ su root password: [[email protected] ~]# su-l hby[[email protected] ~]$

passwd

English Explanation: Password

Role: Modify the user's login password

How to use: passwd username

Note: For root, password complexity is not required, but for ordinary user passwords it must conform to complexity rules, numbers, letter case, and symbol combinations.

Instance:

[Email protected] ~]$ passwd hbypasswd: Only the root user can specify the user name. [[email protected] ~]$ su root password: [[email protected] hby]# passwd hby change user hby password. New Password: invalid password: Too simplistic/systematized invalid password: Too simple to reenter the new password: passwd: All authentication tokens have been successfully updated. [Email protected] hby]#

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