keeps/deletes a number of sites from a given file 
  
 -f[ile]   file     : GLOBK back/forward solution file
  
 -sf                : search file.
 [search_file] 
  
 -i                 : Turn OFF ignorecase. Makes it case sensitive
  
 -d[elete]          : Delete the occurance of search file contents.
                      Defaults is ONLY keep  search file contents.  
  
 -o                 : output file. delault is grep_file
 [out_file] 
  
 -[c]opy            : overwrite input file
  
 -[s]ilent          : work silently
  
  M. Burc Oral     253-2471         oral@gps.mit.edu             Mon Oct  4 13:23:39 EDT 1993