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Wednesday, November 22, 2017

Which Linux file access mode below corresponds to the numeric mode 750?

Which Linux file access mode below corresponds to the numeric mode 750?

  • rwxrwxrwx
  • rw-r--r--
  • rwxr-x---
  • r-xr----- 

Which Linux file access mode below corresponds to the numeric mode 750?

EXPLANATION

Each octal digit corresponds to the three bits for that access type, in order. The read, write, and execute bits are the 4, 2, and 1 bit respectively.
The first digit (7) is for the file owner ("user"), and is the sum of all three bits: read (4) + write (2) + execute (1).
The second digit (5) for the owning group is read (4) + execute (1).
The final digit is zero, meaning no access for "other" users.
Wikipedia page on Unix file modesOnline permission calculator
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