08-16-2011
This User Gave Thanks to itkamaraj For This Post:
9 More Discussions You Might Find Interesting
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is there Any command to get total count and number of free inodes on a mount. please help (5 Replies)
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Hi Friends,
Need help regarding counting the word "friend" in files test1.txt and test2.txt. ( there is no gap/space between word )
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himynameisrajandiamfriendofrajeshfriend
wouldyouliketobemyfriend.
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5. Shell Programming and Scripting
i want to find the no:of occurrences of a word in a file
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unix script unix script
unix script unix script unix script unix script
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unix
script
unix script unix script now i want to find , how many times 'unix' was occurred
please help me
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6. UNIX for Dummies Questions & Answers
Hi All,
When i give ls -ltr i get 'total 10' like this along with files long listing. is there any option in ls command to remove this line or do we need use head -1 command only.
$ls -ltr
total 45
-rw-r--r-- 1 abc g1 0 Jul 17 07:20 0
-rw-r--r-- 1 abc g1 744 May 9 12:10 a
-rw-r--r--... (1 Reply)
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Dear all,
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8. Shell Programming and Scripting
I have list of file names in filename.txt
below is file format
>>File1
_________________________
01~12345~Y~YES~aaaaa~can
02~23456~N~NO~bbbbb~can
.
.
.
99~23__________________________
Need to find total count from each file depending on specific string and add them to have total count... (17 Replies)
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9. Shell Programming and Scripting
Hi all,
I have found another post threads talking about count duplicate lines, but I am interested in obtain the total number of duplicates. For example:
#file.txt
a1
a2
a1
a3
a1
a2
a4
a5
#out
3 (lines are duplicates)
Thank you! (12 Replies)
Discussion started by: mikloz
12 Replies
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)