GNU `bc` is a command-line arbitrary-precision calculator language [1]. It seems the parent comment's author implemented an alternative version that is now ship

GNU `bc` is a command-line arbitrary-precision calculator language [1]. It seems the parent comment's author implemented an alternative version that is now shipping in macOS, presumably because Apple doesn't like the GNU licenses. [1] https://www.gnu.org/software/bc/manual/html_mono/bc.html https://www.gnu.org/software/bc/manual/html_mono/bc.html