Arch Linux + ConTeXt
The command-line program to use for ConTeXt is
texexec. (The lower-level
context command may work in other distros but it doesn't in Arch currently. Luckily,
texexec is great.)
ConTeXt currently requires Ruby older than Arch Linux's 2.0. Install e.g. Ruby 1.9 from AUR. Use
env PATH="/opt/ruby1.9/bin:$PATH" texexec
Hopefully this will be out of date by the time you read it!