postProcessFile determines if path is a script file based on heuristics and makes in-place changes to the file with some post-processing such as BOM and DOS-line endings fixes to make the script POSIX-friendly.

TailFile returns the last max bytes (or the entire file if the file size is smaller than max) from the file at path.

UrlToFileName parses given URL and returns the section after the last slash character of the path segment to be used as a file name.