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What does the numeric permission mode 644 allow the owner of a file to do?

easy📝 Conceptual Q1 of 15
Linux CLI - File Permissions and Ownership
What does the numeric permission mode 644 allow the owner of a file to do?
ARead, write, and execute the file
BOnly read the file
CRead and write the file
DOnly execute the file
Step-by-Step Solution
Solution:

  1. Step 1: Understand numeric permission digits

    The first digit (6) represents the owner's permissions. 6 means read (4) + write (2) = 6.

  2. Step 2: Interpret owner permissions for 644

    Owner can read and write, but not execute (execute is 1, not included).

  3. Final Answer:

    Read and write the file -> Option C

  4. Quick Check:

    Owner permissions for 6 = read + write [OK]
Quick Trick: First digit is owner permissions: 6 means read+write [OK]
Common Mistakes:
MISTAKES
  • Confusing execute permission with write
  • Mixing up owner and group permissions

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