Multiple choice technology operating systems

Which one of the following command shows the last 50 commands the user has entered.

  1. fc -l 50

  2. fc -l -50

  3. history 50
  4. history $$
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

The 'fc' (fix command) builtin lists command history. 'fc -l -50' displays the last 50 commands from history (negative offset means 'count back from most recent'). Option A 'fc -l 50' would show commands 50 onward from the oldest. Option C 'history 50' is a bash-specific command not in ksh, and Option D '$$' is the current PID.

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