#------------------------------------------------------------------------------
#
#  FileCopy.py
#  Illustrates reading from and writing to files in Python.  Copies the file
#  named in the first command line argument to a new file named in the second
#  command line argument. For instance, the following line will copy the
#  contents of file1 into file2, which will be created if it does not exist.
#
#            python FileCopy.py file1 file2 
#
#  Warning: file2 will be overwitten if it already exists.
#
#  Exercise: 
#  Write a program that does everything this one does, but first tests whether
#  file2 exists, and if it does, creates a backup copy of it called file2.bak.
#
#------------------------------------------------------------------------------
import sys

# main() ----------------------------------------------------------------------
def main():

   if len(sys.argv)!=3:
      print("Usage:") 
      print("python", sys.argv[0], "<input file>", "<output file>")
      exit()
   # end if
   
   fin = open(sys.argv[1])
   fout = open(sys.argv[2], 'w') 
   
   for line in fin:
      print(line[:-1], file=fout)
   # end for

   fin.close()
   fout.close()

# end main() ------------------------------------------------------------------

# -----------------------------------------------------------------------------
if(__name__=='__main__'):

   main()

# end if ----------------------------------------------------------------------