Change linux user password

#if you dont't have your root password => then don't use sudo command

# passwd <username>
Current password:
New password:
Retype new password:
passwd: password updated successfully

Chnage the password of user n linu

sudo passwd vivek

Linux change password chpasswd

# Chpasswd command is very simple to use 
[ root@myhost ~ ] # echo "tom:1234" | chpasswd
 
# Using the passwd command, you can also change the password in a batch like mode
[ root@myhost ~ ] # echo "1234" | passwd --stdin "tom" 
Changing password for user tom.
 passwd: All authentication tokens Updated successfully.

Source: linuxaria.com

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