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Full Discussion: Adding delimiter to a fixed pattern of date
Top Forums Shell Programming and Scripting Adding delimiter to a fixed pattern of date Post 302920140 by Don Cragun on Tuesday 7th of October 2014 01:48:29 PM
Old 10-07-2014
Quote:
Originally Posted by Sharma331
I dont have gawk!

---------- Post updated at 03:01 AM ---------- Previous update was at 03:00 AM ----------

Hi Don,

Can you please tell me which part of your suggested code adds space after the last two characters of the line?

Thanks
The code I gave you does not add any space after the last two characters on the line as long as the input you give it is in the format you specified (your sample data included dates presented as a string of 15 or 16 non-space characters sometimes followed a single space character). Since your input file has additional characters at the end of the line that you didn't tell us about before, I'm not surprised that the output doesn't work for you.

In the future, please don't waste your time and ours by giving us sample data that is not representative of your actual data. If you would have given us representative data to begin with, you would probably have gotten working code in 2 or 3 posts instead of the 13 posts this thread took to solve your problem.
This User Gave Thanks to Don Cragun For This Post:
drl
 

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LEARN ABOUT DEBIAN

bup-margin

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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