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How to create a user in Ubuntu/Debian: “useradd” command usage, a beginner’s guide

The “useradd” command in linux is a popular tool used to create or add user accounts.Much like the command “usermod”, the “useradd” command affects many files when it is invoked to create a new user account, namely, /etc/shadow, /etc/passwd, /etc/gshadow , /etc/login.defs, /etc/group