Command line webcam apps

On my old PowerPC iBook I used Videoscript and the macam webcam driver with a CGI system I wrote to take webcam pictures via a webpage, from my external Logitech Quickcam Pro 4000. With my relatively new Intel-based iMac I'm not having any success in getting Videoscript to take pics.
My question- has anyone used Videoscript with an Intel Mac, or in general, any suggestions as to command line-based apps to take a picture with an external camera? I tried macaw, but the pics all come out dark, and isightcapture, which seems good in general, but I haven't determined how to make it use the external cam rather than the built-in...
iMac Mac OS X (10.4.8)

Thanks for the reply. Yeah, I'd tried -d as well as different -i options. The -d debugging output is below, and "-i 0" and "-i 1" both result in the built-in camera being used, and anything above 1 results in this error:
<pre>
DEBUG: initialize toolbox
DEBUG: opening default component
DEBUG: querying component list
DEBUG: query component list
DEBUG: found component
FATAL: sequence grabber component not found, cam not connected ?
</pre>
wacaw actually has a -L (list) option, which lists available inputs, which is an option I'd expect isightcapture to have, since it has the -i. This is what it returns:
<pre>
There are 4 devices in the list.
The current selection is 3.
0 - DV Video [available] [not inputs]
1 - IIDC FireWire Video [available] [not inputs]
2 - Logitech QuickCam Pro 4000 [available] [not inputs]
There are 1 inputs for this device.
The current selection is 0.
0 - Logitech QuickCam Pro 4000 #0 [available]
3 - USB Video Class Video [available] [could be inputs]
There are 1 inputs for this device.
The current selection is 0.
0 - Built-in iSight [available]
</pre>
So they don't match the 0 and 1 that isightcapture accepts.
The isightcapture -d output:
<pre>
DEBUG: initialize toolbox
DEBUG: opening default component
DEBUG: querying component list
DEBUG: query component list
DEBUG: found component
DEBUG: initialize default
DEBUG: setting data ref
DEBUG: setting channel
DEBUG: create gworld
DEBUG: setup gworld
DEBUG: setup channel bounds
DEBUG: setup channel usage
DEBUG: setup data proc
DEBUG: prepare
DEBUG: start recording
DEBUG: setup decompression
DEBUG: getting channel discription
DEBUG: setup decompression sequence
DEBUG: entering grabber loop
DEBUG: received frame
DEBUG: received frame
DEBUG: received frame
DEBUG: received frame
DEBUG: received frame
DEBUG: received frame
DEBUG: received frame
DEBUG: received frame
DEBUG: received frame
DEBUG: received frame
DEBUG: received frame
DEBUG: received frame
DEBUG: received frame
DEBUG: received frame
DEBUG: received frame
DEBUG: received frame
DEBUG: received frame
DEBUG: received frame
DEBUG: received frame
DEBUG: received frame
DEBUG: received frame
DEBUG: received frame
DEBUG: received frame
DEBUG: received frame
DEBUG: received frame
DEBUG: received frame
DEBUG: received frame
DEBUG: received frame
DEBUG: received frame
DEBUG: received frame
DEBUG: received frame
DEBUG: received frame
DEBUG: successfully captured frame
DEBUG: exporting image...
</pre>
I emailed the auther last night, so we'll see... Thanks a lot.

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