It is available for Unix and Win95/NT systems. It takes a bit of monkeying around to get it up and running. I usually start at www.perl.com to get the Win95/NT version of perl5. Then go to the CPAN (see www.perl.org) to get a version of libwww. -----Original Message----- From: Bjoern Gimle [mailto:b_gimle@algonet.se] Sent: Wednesday, July 29, 1998 2:03 AM To: SeeSat-L Subject: SV: potential visibility utility Eric Thayer <eht@cs.cmu.edu> wrote: > >I extract the catalog numbers in the quicksat predictions from the evening >(configured to only give one line per satellite). > >Next I give these catalog numbers to a perl script that gets the TLE's from >OIG. > >The perl code is at http://www.cs.cmu.edu/~eht/sat/oig-get.pl >.... Is perl only available for Unix ? I have used a similar technique to create an elset file when I travel to a place far south from me. I run predictions for the vacation resort, then for (a longer time) at my home location. My program 'buildsel filename selectionfile' can build a table of all unique ID's found in each of the two runs. A 'dif' program finds all objects visible at the southern location 'never' visible from home. 'applysel alldat.tle smallselectionfile small.tle' builds a clean tle file with only 'new' objects.