Learn Linux File Permissions

Understand how octal and symbolic Unix permissions map to read/write/execute.

Níl gá le logáil isteach

Octal (editable)

rwxr-xr-x

Symbolic

Command

$ chmod 755 filename

Common presets

Learning Linux tips

🐧

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.

💡

The three digits are owner, group, other — in that order. 750 = owner full, group read+execute, other nothing.

🎯

Edit the octal field directly to reverse-engineer what a permission like 644 actually grants.

Cuir isteach

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