Ad Hoc Protocols in Unix - oilshell/oil GitHub Wiki

shebang lines: recognized by the kernel
gF in Vim recognizes filename and line number!
/* vim */ options
yacc, in y.tab.c output:
- #line 407 "/usr/homes/chet/src/bash/src/parse.y" /* yacc.c:1646 */
- this appears to be recognized by code coverage reporting tools? They show parse.y output.
  - This actually affects the C compiler's idea of "current file and line". It affects error messages from C compiler, and debug info that goes into/alongside the executable. Code coverage tools probably read the debug info. I think it was invented as an internal protocol between C preprocessor -> C compiler, but proved useful for public use by code generation tools like yacc...
various "text files" in /proc on Linux