The skip keyword tells the program to skip lines at the start of a text
(i.e. not binary) data file.  The lines that are skipped do not count toward
the line count used in processing the every keyword.  Note that skip N
skips lines only at the start of the file, whereas every ::N skips lines at
the start of every block of data in the file.  See also binary skip (p. 
) for a
similar option that applies to binary data files.