A user, jsmith, needs access to database files located on a server. Which of the following will add jsmith to the "dba" group and preserve existing group memberships?

Question

Options

• Ausermod -a -G dba jsmith
• Busermod -g dba jsmith
• Cuseradd -g dba jsmith
• Dgroupmod dba -u jsmith

• A
  93% (27)
• C
  3% (1)
• D
  3% (1)

Explanation

'usermod -a -G dba jsmith' is the correct command. The '-G' flag specifies supplementary (secondary) groups, and the '-a' (append) flag is critical - it adds the user to the specified group without removing them from any other groups they already belong to. Without '-a', '-G' alone would replace all existing supplementary group memberships. Option B ('usermod -g') changes the user's primary group, not supplementary groups. Option C ('useradd -g') attempts to create a new user account rather than modifying an existing one. Option D ('groupmod') is used to modify group properties, not to add members to a group.

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