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#!/usr/bin/env python3
import sys
buf = ""
with open(sys.argv[1], 'r+b') as f:
buf = f.read()
if buf.find(b'\r\n'):
print(f"{sys.argv[1]} is already a CRLF file")
sys.exit(1)
buf = buf.replace(b'\n', b'\r\n')
with open(sys.argv[1], 'w+b') as f:
f.write(buf)
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