wget is very useful for acquiring data from, e.g., IRSA, the NASA Infrared Science Archive. wget -nd -r -l1 -A*g09*_b4_20.fits http://irsa.ipac.caltech.edu/data/IGA/images/ The important elements: -nd: don't reproduce the host directory structure -r: recursive. Grab the files referred to by the page, not just the page itself -l#: number of recursion levels -A: "accept" wildcard