ACSP Command-Line Interface 4

Question 1

Which command displays the current user's username in macOS Terminal?

Accepted Answer

whoami

Answer

The `whoami` command prints the effective username of the currently logged-in user.

Question 2

A technician wants to view only the last 20 lines of a large log file. Which command achieves this?

Accepted Answer

tail -n 20 logfile.log

Answer

`tail -n 20` outputs the last 20 lines of the specified file.

Question 3

Which command would you use to change the ownership of a file to a different user in macOS?

Accepted Answer

chown newuser filename

Answer

`chown` (change owner) sets the user and/or group ownership of a file.

Question 4

What does the `&&` operator do when used between two shell commands?

Accepted Answer

Runs the second command only if the first succeeds

Answer

`&&` is a logical AND; the second command executes only when the first exits with status 0 (success).

Question 5

Which `find` command locates all `.log` files modified within the last 7 days under `/var/log`?

Accepted Answer

find /var/log -name '*.log' -mtime -7

Answer

`find` with `-mtime -7` matches files modified less than 7 days ago.

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