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Re: Syntax Question...


From: Michael Witten
Subject: Re: Syntax Question...
Date: Sun, 14 Aug 2011 05:56:43 +0000

On Sun, Aug 14, 2011 at 04:55, Linda Walsh <address@hidden> wrote:
>
>
>
> ` Michael Witten wrote:
>>
>> On Sat, Aug 13, 2011 at 23:41, Linda Walsh <address@hidden> wrote:
>>
>>>
>>> ${#${!name}[*]}
>>> bash: ${#${!name}[*]}: bad substitution
>>>
>>
>> It's probably what you're trying to avoid, but you'll probably have to
>> construct and then eval the right code by hand:
>>
>>  $(eval "echo \${#$name[*]}")
>>
>
> bingo.  (sigh)
>
> I refactored and am essentially using spaces to store the values in
> a string, then when I want to check the, I throw them into an array and
> manip.
> e.g. (not showing all supporting code)
>
>  declare -axr _plst_t='_plist_'
>  declare -axl defined_PLists=()
>
> add things to the list...
>
>   plist="$_plst_t$plist"
>   local -al plist_deps=( $plist )
>
> {search for value in list, ...]
>
>   unless ((found)) ; then
>       plist_deps[${#plist_deps[*]}]="$subdep"
>       eval "$plist=( "address@hidden" )"
>   fi

You want this:

  unless ((found)) ; then
    plist_deps+=("$subdep")
    eval $plist='("address@hidden")'
  fi

Of course, isn't the variable `plist' supposed to be a reference to
your *string* variable that holds a space-separated list of items? In
that case, the last line should be:

  IFS=' ' eval $plist='"${a[*]}"'



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