[Solved] Why does the permission notation rw-rw-rw- correspond to the numeric value 666? — Ans: Because read and write permissions equal 6 for each user class | Linux CLI

Linux CLI - File Permissions and Ownership

Why does the permission notation rw-rw-rw- correspond to the numeric value 666?

ABecause execute permission is counted as 6

BBecause read and write permissions equal 6 for each user class

CBecause 6 means full permissions

DBecause write permission alone equals 6

Step-by-Step Solution

Solution:

Step 1: Understand permission values
Read = 4, Write = 2, Execute = 1.
Step 2: Calculate read and write sum
Read(4) + Write(2) = 6.
Step 3: Apply to all user classes
Owner, group, and others all have 'rw-' which equals 6 each.
Final Answer:
Because read and write permissions equal 6 for each user class -> Option B
Quick Check:
rw- = 6, repeated thrice = 666 [OK]

Quick Trick: Read(4) + Write(2) = 6, no execute [OK]

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Why does the permission notation rw-rw-rw- correspond to the numeric value 666?