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From: "Carlos E.R." <robin_listas@es.invalid>
Newsgroups: comp.os.linux.misc
Subject: Re: Are We Back to the "Wars" Now ?
Date: Sun, 24 Nov 2024 00:11:48 +0100
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On 2024-11-23 22:32, Fritz Wuehler wrote:
> Carlos E.R. <robin_lis...@es.invalid> [CE]:
> CE> I dd a hard disk partition, compress it, and at the same time
> CE> calculate a checksum.
> CE>
> CE>     mkfifo mdpipe
> CE>     dd if=/dev/$1  status=progress  bs=16M | tee mdpipe | pigz -3 > $3.gz &
> CE>     md5sum -b mdpipe | tee -a md5checksum_expanded
> CE>     wait
> CE>     rm mdpipe
> CE>     echo "$3" >> md5checksum_expanded
> 
> 
> David B Rosen has written the tpipe(1) utility for exactly such cases:
> 
> The above steps can be rewritten in a much cleaner way as:
> 
>    dd if=/dev/$1  status=progress  bs=16M |
>    tpipe "md5sum -b >> md5checksum_expanded" |
>    pigz -3 > $3.gz
> 
> 
> If tpipe is not available on your system, 

it is not.

Telcontar:~ # tpipe
If 'tpipe' is not a typo you can use command-not-found to lookup the 
package that contains it, like this:
     cnf tpipe
Telcontar:~ # cnf tpipe
  tpipe: command not found
Telcontar:~ # opi tpipe
Searching repos for: tpipe
1. inputpipe
2. socketpipe
3. inputpipe-debuginfo
4. socketpipe-debuginfo
5. inputpipe-debugsource
6. socketpipe-debugsource
Pick a number (0 to quit): 0
Telcontar:~ #


> you can always use the shell's
> process substitution feature instead:
> 
>    dd if=/dev/$1  status=progress  bs=16M |
>    tee >(md5sum -b >> md5checksum_expanded) \
>        >(pigz -3 > $3.gz) \
>        >/dev/null
> 

I like my way, it is mine :-)

-- 
Cheers, Carlos.