Use iproute2 to list interface names, UP/DOWN flags, and link information such as MAC addresses.
Do not change addresses or routes.
Which command is appropriate?
ip link show displays link-layer state, flags, MTU, and link addresses for interfaces without changing configuration.
Detailed explanation
ip link showCorrect. It displays link-layer information for interfaces.
Correct. It displays link-layer information for interfaces.
ip address addIncorrect. address add changes an IP address.
Incorrect. address add changes an IP address.
ip route flushIncorrect. route flush removes routes.
Incorrect. route flush removes routes.
ip neigh replaceIncorrect. neigh replace changes a neighbor entry.
Incorrect. neigh replace changes a neighbor entry.
Try it yourself
An example you can run in a temporary verification environment.
printf '%s
' 'ip link show -> interface flags, state, MTU, link address'Expected result
ip link show -> interface flags, state, MTU, link addressKey points
- Read link information
- List all interfaces
- Do not change configuration
Notes
- Environment: 操作対応表の表示のみ
- 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.