Filter a cdfp by using a file of line numbers. These line numbers are usually collected in a ds9 regions file and the line values are extracted with ds9_get_circle_text. This routine is useful for cleaning up data sets for calibration such as in usno_look_wcs.

% cdfp_filter_by_linenum.sh --help 

Usage: cdfp_filter_by_linenum.sh usno_targs.cdfp ds9_get_circle_text.out N 
arg1 - name of input cdfp file 1
arg2 - name of file of desired line numbers 
arg3 - run in debug/verbose mode