GNU logs - #30177, boring messages

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Subject: bug#30177: improve shred manpage
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i tried to compare performance of shred and dd, because a colleague told, shred -n0 -z would be faster.

the shred manpage tells:
If FILE is -, shred standard output 

But:
# shred - | pv >/dev/null
shred: - invalid file type
0 B 0:00:00 [   0 B/s]  [<=>

i found https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=155175 

as "-" works when redirecting to a file, i assume it doesn't work with a pipe because shred needs to seek within the file, which is not possible with a pipe.

i think shred -n0 -z  could be handled as a special case but it would not be worth the effort.

could you perhaps enhance the manpage apropriately, as already suggested in the debian bugreport?

regards 
roland

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From: help-debbugs@HIDDEN (GNU bug Tracking System)
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Subject: bug#30177: Acknowledgement (improve shred manpage)
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Date: Fri, 19 Jan 2018 20:57:02 +0000

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severity 30177 wishlist
retitle 30177 doc: shred: mention stdin must be a file, not a pipe

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severity 30177 wishlist
retitle 30177 doc: shred: mention stdin must be a file, not a pipe

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