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Top Forums Shell Programming and Scripting Get min and max value in column Post 302934604 by jiam912 on Monday 9th of February 2015 07:53:13 AM
Old 02-09-2015
Get min and max value in column

Gents,

I have a big file file like this.

Code:
5100010002
5100010004
5100010006
5100010008
5100010010
5100010012
5102010002
5102010004
5102010006
5102010008
5102010010
5102010012

The file is sorted and I would like to find the min and max value, taking in the consideration key1 (substr$0,1,5) and key2 substr($0,6,5)

I would like to get something like this

Code:
51000 10002 10012
51020 10002 10012

Thanks for your help


Moderator's Comments:
Mod Comment
Please wrap all code, files, input & output/errors in CODE tags
It makes them easier to read and preserves multiple spaces in case they are important.

Last edited by rbatte1; 02-09-2015 at 09:04 AM.. Reason: Added CODE & ICODE tags
 

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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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