On 6/10/16 8:53 AM, [email protected] wrote:
> Bash Version: 4.3
> Patch Level: 11
> Release Status: release
>
> Description:
> [Detailed description of the problem, suggestion, or complaint.]
>
> Repeat-By:
> #!/bin/bash
> declare var
> declare -a ary
> declare -A asoc
>
> var=1
> ary=(1)
> asoc[a]=1
>
> for a in var ary asoc; do
> printf '%s\t' "$a"
> if test -v "$a"; then
> echo ✓
> else
> echo ✗
> fi
> done
>
> <<OUTPUTS
> var ✓
> ary ✓
> asoc ✗
> OUTPUTS
Referencing an array variable without a subscript is equivalent to
referencing element 0 (or "0" for associative arrays). Plus, `test -v'
works on variable names, not dereferenced variables or array elements.
You can test whether or not a specific element is set by testing
whether it is non-empty (test -v 'ary[1]'), or test whether an array has
any elements set using something like [ ${#ary[@]} -gt 0 ].
One of the things that may come into a future version is something like
test -v 'array[@]' to see whether or not an array has any elements set.
Chet
--
``The lyf so short, the craft so long to lerne.'' - Chaucer
``Ars longa, vita brevis'' - Hippocrates
Chet Ramey, ITS, CWRU [email protected] http://cnswww.cns.cwru.edu/~chet/
