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docs: Rename cross to cartesian product, clarify

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Fabian Homborg 2015-09-17 14:17:52 +02:00
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commit b13ee9da2a
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doc_src/tutorial.hdr
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@ -348,14 +348,21 @@ You can iterate over a list (or a slice) with a for loop:
<outp>entry: /usr/local/bin</outp>
\endfish
If you append a list to a string (or to a list), it will build the cross-product:
Lists adjacent to other lists or strings are expanded as cartesian products unless quoted (see <a href="index.html#expand-variable">Variable expansion</a>):
\fish{cli-dark}
>_ set -l a 1 2 3
>_ set -l 1 a b c
>_ echo $a$1
<outp>1a 2a 3a 1b 2b 3b 1c 2c 3c
<outp>1a 2a 3a 1b 2b 3b 1c 2c 3c</outp>
>_ echo $a" banana"
<outp>1 banana 2 banana 3 banana</outp>
>_ echo "$a banana"
<outp>1 2 3 banana</outp>
\endfish
This is similar to <a href="index.html#expand-brace">Brace expansion</a>.
\section tut_command_substitutions Command Substitutions
Command substitutions use the output of one command as an argument to another. Unlike other shells, `fish` does not use backticks ` for command substitutions. Instead, it uses parentheses: