autotype: Executables
8 Making Interpreter Scripts Executable
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Various interpreter modes such as Shell script mode or AWK mode will
automatically insert or update the buffer’s magic number, a special
comment on the first line that makes the ‘exec’ systemcall know how to
execute the script. To this end the script is automatically made
executable upon saving, with ‘executable-chmod’ as argument to the
system ‘chmod’ command. The magic number is prefixed by the value of
‘executable-prefix’.
Any file whose name matches ‘executable-magicless-file-regexp’ is not
furnished with a magic number, nor is it made executable. This is
mainly intended for resource files, which are only meant to be read in.
The variable ‘executable-insert’ says what to do when
‘executable-set-magic’ is called non-interactively, e.g., when file has
no or the wrong magic number:
‘nil’
Do nothing.
‘t’
Insert or update magic number.
other
Insert or update magic number, but mark as unmodified.
The variable ‘executable-query’ controls whether to ask about
inserting or updating the magic number. When this is ‘nil’ updating is
only done with ‘M-x executable-set-magic’. When this is ‘function’ you
are queried whenever ‘executable-set-magic’ is called as a function,
such as when Emacs puts a buffer in Shell script mode. Otherwise you
are always queried.
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