Lucas123 writes "Greg Chamitoff, a computer programmer who wrote software for NASA's Endeavour spacecraft, will be blasting off on shuttle's final 15-day flight as a mission specialist on Friday. Chamitoff, who created software focused on spacecraft analysis and maneuver optimization, will operate the space station's robotic arm, and he'll also take part in two spacewalks."
egrep patterns are full regular expressions; it uses a fast deterministic
algorithm that sometimes needs exponential space.
-- unix manuals