Re: Are We Back to the "Wars" Now ?

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.