read_file_from_first_arg.py

#!/usr/bin/python

import sys

def read_file(f):
    print(f.read())


def main():

    if len(sys.argv) < 2:
        print('Usage: ' + sys.argv[0] + ' <file>')
        exit(-1)

    f_name = sys.argv[1]

    with open(f_name, 'r') as f:
        read_file(f)


main()