05-20-2014
This User Gave Thanks to RudiC For This Post:
10 More Discussions You Might Find Interesting
1. Shell Programming and Scripting
Hi All,
I want to find a specific pattern from approximately 400000 files on solaris platform. Its very heavy for me to grep that pattern to each file individually.
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I wanted to see if some one could confirm the proper command and format for copying specific files i.e., ones that contain certain character string in the file name. I would like to copy all files that contain a numeric sequence in the file name i.e., "922371". Files are compressed - *.gz. Would... (3 Replies)
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Hi All,
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Hi,
I have to copy a set of files abc* in /path/ to /path1/ as abc*_bkp.
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.
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. (6 Replies)
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5. Shell Programming and Scripting
Hi Folks,
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6. Shell Programming and Scripting
Hi friends,
I have data in tab separated file with headers like this :
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7. Shell Programming and Scripting
How can I list files with the following specific criteria?
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Hi All,
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Murali (7 Replies)
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9. Shell Programming and Scripting
I am trying to make my script as simple as a possible but, I am not sure if the way I am approaching is necessarily the most efficient or effective it can be. What I am mainly trying to fix is a for loop to remove a string from the specified files and within this loop I am trying to copy the lines... (2 Replies)
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10. Shell Programming and Scripting
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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)