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Full Discussion: sed confusion
Top Forums UNIX for Beginners Questions & Answers sed confusion Post 302987038 by Scrutinizer on Saturday 3rd of December 2016 08:07:38 PM
Old 12-03-2016
Not sure what you are after. If you want to used sed to act on the bit of shell code you posted as input file:

Try:
Code:
$ echo 'X=(0 2 4 6 7 0 0 0 0)' | sed 's/\( 0\)\{1,\})/)/'
X=(0 2 4 6 7)

or with -E (BSD sed) or -r (GNU sed)
Code:
$ echo 'X=(0 2 4 6 7 0 0 0 0)' | sed -E 's/( 0)+\)/)/'
X=(0 2 4 6 7)



--
Note: using \n in the replacement part of a substitution (s-command) is a GNU sed only extension.

Last edited by Scrutinizer; 12-03-2016 at 09:17 PM..
 

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bup-margin(1)						      General Commands Manual						     bup-margin(1)

NAME
bup-margin - figure out your deduplication safety margin SYNOPSIS
bup margin [options...] DESCRIPTION
bup margin iterates through all objects in your bup repository, calculating the largest number of prefix bits shared between any two entries. This number, n, identifies the longest subset of SHA-1 you could use and still encounter a collision between your object ids. For example, one system that was tested had a collection of 11 million objects (70 GB), and bup margin returned 45. That means a 46-bit hash would be sufficient to avoid all collisions among that set of objects; each object in that repository could be uniquely identified by its first 46 bits. The number of bits needed seems to increase by about 1 or 2 for every doubling of the number of objects. Since SHA-1 hashes have 160 bits, that leaves 115 bits of margin. Of course, because SHA-1 hashes are essentially random, it's theoretically possible to use many more bits with far fewer objects. If you're paranoid about the possibility of SHA-1 collisions, you can monitor your repository by running bup margin occasionally to see if you're getting dangerously close to 160 bits. OPTIONS
--predict Guess the offset into each index file where a particular object will appear, and report the maximum deviation of the correct answer from the guess. This is potentially useful for tuning an interpolation search algorithm. --ignore-midx don't use .midx files, use only .idx files. This is only really useful when used with --predict. EXAMPLE
$ bup margin Reading indexes: 100.00% (1612581/1612581), done. 40 40 matching prefix bits 1.94 bits per doubling 120 bits (61.86 doublings) remaining 4.19338e+18 times larger is possible Everyone on earth could have 625878182 data sets like yours, all in one repository, and we would expect 1 object collision. $ bup margin --predict PackIdxList: using 1 index. Reading indexes: 100.00% (1612581/1612581), done. 915 of 1612581 (0.057%) SEE ALSO
bup-midx(1), bup-save(1) BUP
Part of the bup(1) suite. AUTHORS
Avery Pennarun <apenwarr@gmail.com>. Bup unknown- bup-margin(1)
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