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Learn Linux File Permissions
Understand how octal and symbolic Unix permissions map to read/write/execute.
ورود لازم نیست
| Read | Write | Execute | Value | |
|---|---|---|---|---|
| owner | 7 | |||
| group | 5 | |||
| other | 5 |
Octal (editable)
rwxr-xr-x
Symbolic
Command
$ chmod 755 filename
Common presets
Learning Linux tips
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Each digit is the sum of read (4) + write (2) + execute (1). So 7 = rwx, 5 = r-x, 6 = rw-. Toggle the boxes to see it click.
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The three digits are owner, group, other — in that order. 750 = owner full, group read+execute, other nothing.
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Edit the octal field directly to reverse-engineer what a permission like 644 actually grants.
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