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docs: Mention command-substitution splitting in tutorial

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See #4097.
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Fabian Homborg 2017-06-06 22:05:23 +02:00
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commit 822ee634c4
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doc_src/tutorial.hdr
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@ -391,6 +391,17 @@ Command substitutions are not expanded within quotes. Instead, you can temporari
<outp>testing_1360099791.txt</outp>
\endfish
Unlike other shells, fish does not split command substitutions on any whitespace (like spaces or tabs), only newlines. This can be an issue with commands like `pkg-config` that print what is meant to be multiple arguments on a single line. To split it on spaces too, use `string split`.
\fish{cli-dark}
>_ printf '%s\n' (pkg-config --libs gio-2.0)
<outp>-lgio-2.0 -lgobject-2.0 -lglib-2.0</outp>
>_ printf '%s\n' (pkg-config --libs gio-2.0 | string split " ")
<outp>-lgio-2.0
-lgobject-2.0
-lglib-2.0</outp>
\endfish
\section tut_combiners Combiners (And, Or, Not)