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"""Require Unix line endings."""
from __future__ import annotations
import sys
def main():
"""Main entry point."""
for path in sys.argv[1:] or sys.stdin.read().splitlines():
with open(path, 'rb') as path_fd:
contents = path_fd.read()
if b'\r' in contents:
print('%s: use "\\n" for line endings instead of "\\r\\n"' % path)
if __name__ == '__main__':
main()
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