Linux: Instructions on using commands about User and Group on Linux

  • Structure of / etc / passwd file
  • Structure of /etc/shadow file
  • Useradd command: Create new Local User
  • Usermod command: Modify exist Local User
  • Userdel command: Delete exist Local User
  • Chage command
  • su command: su stands for substitute user
  • Create new group
  • Delete group
  • sudo command: sudo allows a permitted user to execute a command as the superuser or another user, as specified by the security policy. The invoking user’s real (not effective) user ID is used to determine the user name with which to query the security policy

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