'''
    commandline.py
    Jeff Ondich, 2013-01-04
    Updated for Python 3, 2019-01-04

    Identical to linereader.py, but takes the input file path from
    the command line rather than from a hard-coded string.

    Intended as the Python half of parallel examples in Python and
    Java. See CommandLine.java.
'''

# START CHANGES
# This is the part that's different from linereader.py.
import sys

if len(sys.argv) != 2:
    print('Usage: python3 {0} inputFilePath'.format(sys.argv[0]), file=sys.stderr)
    exit()

input_file_path = sys.argv[1]
#END CHANGES

try:
    input_file = open(input_file_path)
except Exception as e:
    print('Cannot open {0}'.format(input_file_path), file=sys.stderr)
    exit()

number_of_lines = 0
for line in input_file:
    print(line.upper(), end='')
    number_of_lines += 1
print('\nNumber of lines: {0}'.format(number_of_lines))