What chmod -R 755 does to a directory tree
`chmod -R 755 PATH` applies 0755 (rwxr-xr-x) to PATH and every descendant, including regular files. Decode the bits and review the recursive boundary.
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Decode 0755 and 1777 bit by bit
The first example separates the three rwx triplets of 0755. The second adds sticky to a fully accessible directory and explains exactly why the final display character is t.
Chmod 1777 sticky directory example
Convert 1777 to rwxrwxrwt and separate world-writable directory bits from the sticky restricted-deletion bit.
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