Inspect an /etc/group record.
developers:x:1800:alice,bobWhat does the fourth field represent?
The group fields are name, password marker, GID, and a comma-separated supplementary-member list.
Detailed explanation
Incorrect. The group name is the first field.
Incorrect. The GID is the third field.
Correct. The fourth field lists supplementary members.
Incorrect. /etc/group has no group home-directory field.
Try it yourself
An example you can run in a temporary verification environment.
entry='developers:x:1800:alice,bob'; printf '%s\n' "$entry" | cut -d: -f4Expected result
alice,bobKey points
- Third field is GID
- Fourth is member list
- Primary group comes from passwd
Notes
- Environment: POSIXシェル / 合成レコード
- Command output formatting can vary slightly by distribution or tool version.
- Run the example in a temporary directory or process when possible.
Foundation review
Read the scope first
Check whether the command acts on the current shell, a new process, an existing process, or a file.
Verify the observable result
Use the supplied command and compare the output with the expected result.