Why Elsif not Else If In PLC programming

Question

Im a PLC programmer and I am wondering why the reserved word elsif (ie without the E ) is used. I know that elseif or any other combination is not used as reserved words. Is there a history to use this in other Languages. If so why? just to save on typing cause for me I seem to make the mistake of typing the e probably 5 times a day.

Answer 1

Programming languages have never quite agreed on this. Various common languages use:

else if
elseif
elsif
elif

and perhaps others. There's often no good reason for the language designer choosing one over another.

^{(Bonus points if you can name some languages that use each of the above forms!)}