For all using Nuke on a Mac, I've done a small Apple Script to automize the process of rendering in the terminal. It is based on the automated shake render script found on fxguide, so thanks to geoffroy dantas for this.
Ok, now this is how it works:
Open up Apple Script Editor (/Applications/AppleScript/Script Editor.app) and paste in the following lines:
on open these_items
tell application "Terminal"
repeat with this_item in these_items
set titre to name of (info for this_item)
set question to "enter desired time range for " & name of (info for this_item)
set range to text returned of (display dialog question default answer " 1,100")
set range to range as string
set this_item to quoted form of POSIX path of item 1 of these_items
set shakescript to "/Applications/Nuke4.6/Nuke4.6.app/Contents/MacOS/Nuke4.6 -x " & this_item & range
if (count windows) is 0 then do script ""
do script shakescript in window 1
tell window 1
set title displays shell path to false
set title displays window size to false
set title displays file name to false
set title displays device name to false
set title displays custom title to true
set custom title to titre
Finally save the script as application. Now you can simply throw your Nuke script files on the render app, and it will render out your write node.
hope this is of use...cheers