And as other HN commenters have noted recently, Bourne used #define to make the shell source code look like Algol: https://research.swtch.com/shmacro https://r

And as other HN commenters have noted recently, Bourne used #define to make the shell source code look like Algol: https://research.swtch.com/shmacro https://research.swtch.com/shmacro