Re: How should I construct this?

[peter.d.miller@oracle.com]

On 04/24/2013 02:39 PM, thomasg wrote:
> On Wed, Apr 24, 2013 at 8:16 PM, TJ Luoma <luomat@gmail.com> wrote:
>> I am trying to write a shell script which will help my computer
>> automatically join Wi-Fi networks.
>>
>> Each network needs to have an SSID (which may have spaces in it) and a
>> password (which may have spaces, punctuation, etc in it).
>>
>> I'm trying to figure out the best way to create this.
>>
>> I thought about trying to make an array or something like this where the
>> first 'column' would be the SSID and the 2nd column would be the passwords
>>
>> ALL_WIFI_NETWORKS=(
>>                                  Home
>> 89382ashfa
>>                                  Work
>> 0823u2j98dyumn
>>                                  "Coffee House"          ""
>>                                  "Jenny's Wifi"          8675309
>> )
>>
>>
>> but then I need to be able to loop through $ALL_WIFI_NETWORKS using only
>> first column… something like this
>>
>> for SSID in {{{The First Arg in Each Line of $ALL_WIFI_NETWORKS}}}
>> do
>>                  echo "foo"
>>
>> done
>>
>>
>> where the part in {{{ and }}} indicates the part where I really don't know
>> how to do what I want to do.
>>
>> It seems like there's got to be an easier / better way of doing this, but I
>> can't figure out what it is, other than keeping two lists/arrays, one of the
>> SSIDs, and one with the passwords, but that seems kludgey because I have to
>> ask the user (whoever uses this script besides me) to put the SSIDs in
>> twice.
>>
>> TjL
>>
> What you want to use in a case like this are hashtables.
> Basically this is a special array type, defined like this:
>
> typeset -A ALL_WIFI_NETWORKS
> ALL_WIFI_NETWORKS=(name 'password' name2 'password2)
>
> You can then loop: for FOO in ${(k)ALL_WIFI_NETWORKS}; BAR
>
> Hope this helps,
>
> --
> thomasg
here's another way

I=(a b c d); for ((i=1; i<=$#I/2; i++ )); do echo $I[$((2*i-1))] 
$I[$((2*i))]; done

Peter