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How to get MD5 from a pipe stream and do not alter it?

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# 1  
Old 01-13-2013
How to get MD5 from a pipe stream and do not alter it?
Say I have a stream and want to get MD5 from it, without altering it. I won't know how big the stream is or how much time it will take to close. Here is the idea:

Code:
cat somefile | calculate md5 and put it somewhere | bzip2 > somefile.bz2

# 2  
Old 01-13-2013
Code:
cat somefile | openssl md5 | bzip2 > somefile.bz2

# 3  
Old 01-13-2013
Quote:
Originally Posted by bipinajith
Code:
cat somefile | openssl md5 | bzip2 > somefile.bz2

This is not what I need. That command outputs to stdout the checksum, instead of the original pipe stream.
# 4  
Old 01-13-2013
Code:
cat somefile | openssl md5 >&2 | bzip2 somefile

# 5  
Old 01-13-2013
Quote:
Originally Posted by bipinajith
Code:
cat somefile | openssl md5 >&2 | bzip2 somefile

Same thing

---------- Post updated at 06:01 PM ---------- Previous update was at 05:56 PM ----------

I've found it:

Code:
  cat somefile | tee >(openssl md5 > sum.md5) | bzip2 > somefile.bz2

# 6  
Old 01-13-2013
The cat serves no function in any of these examples.


Code:
< inputfile tee >(openssl md5 > sum.md5) | bzip2 > somefile.bz2

This User Gave Thanks to Corona688 For This Post:
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