What is the purpose of the plus sign in the date command's format specifier '+%F %T.%N %Z'?

• A. It signals that the date should display the formatted date/time instead of trying to set it
• B. It indicates that the current directory should be printed
• C. It is optional and has no effect
• D. It sets the timezone

Answer: (A)

The plus sign introduces a format string for output. When you run the date command with a plus followed by a format (like +%F %T.%N %Z), you’re telling date to format the current date/time according to that template, expanding tokens such as %F (year-month-day), %T (HH:MM:SS), %N (nanoseconds), and %Z (timezone). This is how you customize the exact layout of the date output.

If you omit the plus, the argument would be treated as a date to parse or as a literal input, not as a format template for output, so you wouldn’t get the formatted string you’re aiming for.