org: tangle-mode
14.8.2.22 ‘:tangle-mode’
........................
The ‘tangle-mode’ header argument controls the permission set on tangled
files. The value of this header argument will be passed to
‘set-file-modes’. For example, to set a tangled file as read only use
‘:tangle-mode (identity #o444)’, or to set a tangled file as executable
shebang::) header arguments will automatically be made executable unless
the ‘tangle-mode’ header argument is also used. The behavior is
undefined if multiple code blocks with different values for the
‘tangle-mode’ header argument are tangled to the same file.