Measure Boot Log Timestamps

Read a kernel-style boot log with bracketed seconds timestamps and print the five slowest gaps between consecutive messages.

Constraints

• Timestamps look like '[ 1.234567]'.
• Compute the gap to the following line.
• Print gap, then the message that followed it.
• Sort by gap descending and show only the top 5.
• Lines without a timestamp are ignored.
• Use awk for the arithmetic.