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Subject: bug#20767: seq invocation limitations documentation
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Date: Mon, 08 Jun 2015 07:28:25 +0800
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On (info "(coreutils) seq invocation") perhaps mention if one needs to
use two % items, a for loop might be required,

$ for i in `seq 14484 10000 34484`; do printf %d=0x%x\\n $i $i; done
14484=0x3894
24484=0x5fa4
34484=0x86b4

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Subject: bug#20767: Acknowledgement (seq invocation limitations documentation)
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Subject: bug#20767: seq invocation limitations documentation
Resent-From: Stephane Chazelas <stephane.chazelas@HIDDEN>
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Date: Mon, 8 Jun 2015 10:09:33 +0100
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2015-06-08 07:28:25 +0800, 積丹尼 Dan Jacobson:
> On (info "(coreutils) seq invocation") perhaps mention if one needs to
> use two % items, a for loop might be required,
> 
> $ for i in `seq 14484 10000 34484`; do printf %d=0x%x\\n $i $i; done
> 14484=0x3894
> 24484=0x5fa4
> 34484=0x86b4
[...]

Running several commands in sequence in a loop like that (and
storing the whole output of seq in memory) is not so good an
idea. At this point, it's probably better to use awk:

awk 'BEGIN{for (i = 14484; i <= 34484; i += 10000)
  printf "%d=0x%x\n", i, i}'

See also
https://unix.stackexchange.com/questions/169716/why-is-using-a-shell-loop-to-process-text-considered-bad-practice

Might be worth pointing out awk as a standard alternative to seq
for portability btw.

-- 
Stephane

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Subject: bug#20767: seq invocation limitations documentation
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Date: Mon, 08 Jun 2015 23:08:53 +0800
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Actually it would be great if one could just do
seq -f %d=0x%x 14484 10000 34484
where seq could just take the standard printf arguments, and % could be
used more than once, as I don't think it could mean any second argument...

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severity 20767 wishlist
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severity 20767 wishlist
retitle 20767 seq: support multiple % in -f format

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