'su' command, switch to different user in linux

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How to switch to different user in linux?

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To switch user we use su command which stand for substitute user

su username
# a prompt will ask for password

Most of the time linux OS comes with the user account which may not have root permissions so to switch to root simply type su or su root .

If you are trying to login with root for the first time from user's account, you will need to set password first. Here you can learn Setting root password for the first time and login as root in linux https://forum.devsach.in/discussion/20/setting-root-password-for-the-first-time-and-login-as-root-in-linux#latest