I'd like to take a screenshot of a background window given its title.
I know this can be made with screencapture -l idwindow output
but unluckily I can't use this method because I'm on a Mac OS X 10.5.8 system so the command screencapture doesn't support the option -l.
Are there other ways to achieve this? Thanks in advance.
GrabFS
looks like a nifty tool that can solve your problem. It basically turns running programs into a file system like structure that lets you grab screenshots of those running programs.
Requires Mac OS X Leopard and MacFUSE. You are on 10.5.8 (Leopard?) so that should work out OK.