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md5sum file > file.md5
md5sum file >>file.md5
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md5sum *.iso > iso.md5
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1.Local:#md5sum fileName
Return:Numbercode1 fileName
2.Destination:#md5sum fileName
Return£ºNumbercode2 fileName
3.Check:if Numbercode1=Numbercode2 ,then Destination fileName is the same as local's.
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