Echo "new password" |passwd -- stdin user name

-stdin

This option is used to indicate that passwd should read the new password from standard input, which can be a pipe.

This option is used to read the new password from the standard input pipe .

Use echo Way to reset Linux System user password ：

echo “ New password ”|passwd --stdin user name

[root@rhel7 ~]# passwd --stdin rusky    by rusky User set password .

Changing password for user rusky.

zxcvbnm

passwd: all authentication tokens updated successfully.

[root@rhel7 ~]# echo "qwert"

qwert

[root@rhel7 ~]# echo "qwert" | passwd --stdin rusky   hold echo Characters returned qwert Set to user rusky Password 

Changing password for user rusky.

passwd: all authentication tokens updated successfully.

[root@rhel7 ~]#

It's a simple way , But by history Command can find the user's password , So it's not safe .