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What is the 4-digit octal Unix file permission system? [closed]

3-digit:

644 (user group other) 4-digit:

4750 (??? user group other) What is the first octal digit for in 4-digit octal Unix file permission notation?

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Answer

It is called sticky bit in linux. you can read it detaily from this link: https://www.linuxnix.com/sticky-bit-set-linux/

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