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Numeric Permission System :

Numeric Permission System :

Linux also uses numbers.
Each permission has a value :
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Add them together.

Examples

rwx

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rw-

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r--

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r-x

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7. Most Common Permission Numbers

Number
Meaning
777
rwxrwxrwx
755
rwxr-xr-x
744
rwxr--r--
700
rwx------
666
rw-rw-rw-
644
rw-r--r--

Example: 755

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Result:
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Owner can do everything.
Others can read and execute.

Example: 644

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Result:
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Common for text files.