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docs: Document indexing double-variable-expansion

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Fixes #5886.

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This commit is contained in:
Fabian Homborg 2019-06-19 12:56:01 +02:00
parent 370f5356a1
commit 6c05005f0f
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sphinx_doc_src/index.rst
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@ -969,6 +969,15 @@ However using variables as indices for command substitution is currently not sup
set sequence (seq 5) # It needs to be written on two lines like this.
echo $sequence[$index] # returns '2'
When using indirect variable expansion with multiple `$` (``$$name``), you have to give all indices up to the variable you want to slice::
> set -l list 1 2 3 4 5
> set -l name list
> echo $$name[1]
1 2 3 4 5
> echo $$name[1..-1][1..3] # or $$name[1][1..3], since $name only has one element.
1 2 3
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