To check whether there is an abnormal task plan (not set by the user) on the Linux host, which of the following commands can be used?

Question

Options

• Acrontab -u mysql
• Bcrontab -e
• Ccrontab -r
• Dcrontab -l

• A
  2% (1)
• B
  15% (6)
• C
  7% (3)
• D
  76% (31)

Explanation

crontab -l lists all scheduled cron jobs for the current user, making it the correct tool to inspect task plans and identify any abnormal or unauthorized entries that shouldn't be there. Option A (crontab -u mysql) specifies a target user account but is incomplete without an action flag like -l; on its own it would error out, and checking only the mysql user's crontab is too narrow for a general audit. Option B (crontab -e) opens the crontab in an editor for editing, not viewing - it modifies rather than inspects. Option C (crontab -r) is the most dangerous distractor: it removes the entire crontab, which would destroy evidence of an attack rather than reveal it.

Memory tip: Think of -l as "list" or "look" - you're looking for suspicious entries. The -r stands for "remove," and confusing -r with -l is a classic mistake that can wipe a legitimate crontab, so treat it with caution on the exam and in real life.

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