unknown command ':1' haskell

Question

I just decided to get adventurous and learn some Haskell. I am following along from http://learnyouahaskell.com/. I downloaded the whole Haskell Platform from http://www.haskell.org/platform/mac.html for 64bit Mac Architecture, I already had gcc/command line tools installed, and am not running Mavericks yet.

GHCI runs great, but when I wrote the simple doubleMe exercise, and followed learnyouahaskell's directions to save and run the script, GHCI outputs the following error:
Prelude> :1 baby
unknown command ':1'
use :? for help.

I'm wondering if this command is deprecated or if I'm reading the documentation from LearnYouAHaskell wrong.

Any help is appreciated. Thanks.

Thanks to @icktoofay for the syntax help and answering my question. Here is the original source that caused the confusion:

Screenshot from learnyouahaskell

And here is why numeral 1 and the lowercase letter l was confusing in iTerm:

Screenshot from iTerm

score 38 · Accepted Answer · answered Feb 09 '14 at 07:51

38

GHCi understands :load or its abbreviation :l, not a colon followed by the numeral one.
A lowercase L and the digit 1 do look very similar, so I can understand your confusion.

answered Feb 09 '14 at 07:51

icktoofay

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1

That was exactly the case. the `:?` help command didn't even list `:load` as a command. Good catch, Thanks alot. – sammalaska Feb 09 '14 at 20:48
2

This is very relevant. What a damn joke. I had to come here to figure this out. Now I will go proceed to Learn Me a Haskell... – Dan Zuzevich Mar 24 '18 at 21:56
The font used in Learn Me a Haskell doesn't help. – A.Sanchez.SD Dec 26 '18 at 19:09

unknown command ':1' haskell

1 Answers1