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login Command Cheat Sheet

The login command is used to begin a new session on a terminal. It is typically invoked automatically during system boot.

Manually Invoke Login

login

Login as Another User

login username

Then enter the password when prompted.

Switch to Another User (Preferred)

su - username

Or:

sudo -i -u username
  • /etc/passwd: user account definitions
  • /etc/shadow: encrypted passwords
  • /var/log/auth.log: authentication logs

Notes

  • Normally invoked by getty.
  • Avoid manual use unless in a TTY or recovery shell.