Linux Permission Calculator (chmod)

Permission Bits:
r (4) — Read: view file contents or list directory
w (2) — Write: modify file or add/remove files in directory
x (1) — Execute: run file as program or enter directory

Each digit is the sum of its permissions. E.g. 7 = 4+2+1 = rwx, 5 = 4+1 = r-x