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PermCalc
Decode octal permissions — see exactly who can read, write, and execute.
Each octal digit represents a user class: owner, group, others. The digit is the sum of read (4) + write (2) + execute (1). So 7 = rwx (full access), 5 = r-x (read + execute), 4 = r-- (read only), 0 = --- (no access). 755 means owner has full access, everyone else can read and execute.
644 (rw-r--r--): default for files — owner reads/writes, others read only. 755 (rwxr-xr-x): default for directories and scripts — owner has full access, others can list/traverse. 600 (rw-------): private files like SSH keys. 777: everyone can do everything — almost never appropriate.
What you entered
Owner permissions
7 → read(yes) write(yes) exec(yes)= rwxGroup permissions
5 → read(yes) write(no) exec(yes)= r-xOthers permissions
5 → read(yes) write(no) exec(yes)= r-xFull symbolic notation
chmod 755= rwxr-xr-xResult
Symbolic: rwxr-xr-x
chmod 755 sets permissions to rwxr-xr-x: owner gets rwx, group gets r-x, others get r-x. Each octal digit encodes read (4), write (2), and execute (1).