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Linux Academy by Uirá Ribeiro

Usermod command on Linux (changes user data)

The usermod command on Linux modifies the settings of a particular user account.

It accepts the following options:

  • -d home_directory: This option provides the full path to the user’s home directory;
  • -c “username”: This option saves the name of the account owner or any other important note and comment to the passwd file;
  • -g group_number : This option provides the default user account group;
  • -s shell: This option must provide the full shell path used by the account. For example /bin/bash, /bin/tcsh, /bin/false, etc;
  • -L: Lock the user account by adding the “!” sign in the password;
  • -U: Unlock the user’s account by removing the “!” sign of the password.
  • -e 2019-12-31: Indicates that the account must be deactivated on December 31, 2019. The format must be YYYY-MM-DD.

Examples:

Change the comment, with the username Arthur:

# usermod —c “Arthur Ribeiro” Arthur

Lock the user’s Analima account in the system and no longer allow the login:

# usermod —The anime

User Arthur’s account expires on October 31, 2019:

# usermod-e 2019-10-31 Arthur

You can confirm an account’s expiration date with the chage command with the “-l” option:

# chage -l Arthur <br></br>Last password change: Oct 17, 2019 <br></br>Password expires & nbsp;: never <br></br>Password inactive & nbsp;: never <br></br>Account expires & nbsp;: Oct 31, 2019 <br></br>Minimum number of days between password change: 0 <br></br>Maximum number of days between password change: 99999 <br></br>Number of days of warning before password expires: 7

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