dd if=file | tee >(sha1sum) >(md5sum) >(sha256sum) >/dev/null

Calculate different hash sums of one file at the same time

This is to overcome the issue of slow I/O by reading once and forwarding the output to several processes (e. g. 3 in the given command). One could also invoke grep or other programs to work on read data.
Sample Output
ce67efc071187fe6ee2bd7486cf1307e  -
b16de8c6465bd973188d62e5772f21762d624f0f  -
6c801e3a40ab3e5192420d47f676e7291d8572c4144687e90d59335a47c750ee  -

0
By: dubbaluga
2013-11-07 17:43:54

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