tee

Hash faster from command line using tee

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The tee command is useful when you happen to be transferring a large amount of data and also want to summarize that data without reading it a second time. For example, when you are downloading a DVD image, you often want to verify its signature or checksum right away. The inefficient way to do it is simply:
 
wget http://example.com/some.iso && sha1sum some.iso
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