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add command substition indexing examples (#5303)

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* add command substition indexing examples

following from issue #243

* Update index.hdr.in
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santpent 2018-11-02 12:24:52 +00:00 committed by Fabian Homborg
parent 9300ec55f0
commit 22f794125f
1 changed files with 12 additions and 1 deletions
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doc_src/index.hdr.in
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@ -671,8 +671,19 @@ set n -3
echo $PATH[$n..-1]
\endfish
Note that variables can be used as indices for expansion of variables, but not command substitution.
Variables can be used as indices for expansion of variables, like so:
\fish
set index 2
set letters a b c d
echo $letters[$index] # returns 'b'
\endfish
However using variables as indices for command substitution is currently not supported, so
\fish
echo (seq 5)[$index] # This won't work
set sequence (seq 5) # It needs to be written on two lines like this.
echo $sequence[$index] # returns '2'
\endfish
\subsection expand-home Home directory expansion