import sys
import re

argv = sys.argv
if len(argv) == 1:
    print("")
    print("Usage: python convert_lf.py file_path")
    print("")
    exit()

infile = argv[1]

print("")
print("Convert CR+LF to CR")
print(f"read [{infile}]")
fp = open(infile, 'rb')
str = fp.read();
fp.close()

str = str.decode('utf-8')
str = re.sub(r'\r', '', str)

print(f"write to [{infile}]")
fw = open(infile, 'wb')
fw.write(str.encode('utf-8'))
fw.close()

exit()