Analysis of information sources in references of the Wikipedia article "Shebang (Unix)" in English language version.
{{cite book}}: CS1 maint: multiple names: authors list (link)Macro: AC_SYS_INTERPRETER: Check whether the system supports starting scripts with a line of the form '#!/bin/sh' to select the interpreter to use for the script.
If the first line of a file of shell commands starts with the characters "#!", the results are unspecified
It's much better to test scripts directly in a POSIX compliant shell if possible. The `bash --posix` option doesn't suffice as it still accepts some 'bashisms'