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What will be the output time behavior when running cat largefile.txt twice in a row on the same file?

medium📝 Command Output Q13 of 15
Linux CLI - Viewing and Editing Files
What will be the output time behavior when running cat largefile.txt twice in a row on the same file?
AThe second run will fail because the file is locked.
BBoth runs take about the same time because reading depends on file size.
CThe first run is faster because the file is smaller initially.
DThe second run will be much faster because the file is cached.
Step-by-Step Solution
Solution:

  1. Step 1: Understand caching effect

    Linux caches files in memory after first read, so second read is faster.

  2. Step 2: Compare run times

    First cat reads from disk, second reads from cache, speeding it up.

  3. Final Answer:

    The second run will be much faster because the file is cached. -> Option D

  4. Quick Check:

    Cache speeds second read = D [OK]
Quick Trick: Second read is faster due to caching in memory [OK]
Common Mistakes:
  • Assuming both runs take same time always
  • Thinking file size changes between runs
  • Believing file gets locked after first read

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