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