the problem is while replacing the old string with new one with the help of SED i am unable to replace the special characters with new strings. how can i do that?
i dont want the user to be given the trouble to write '\' before every special characters like * , . , \ , $ , &.
sed... (4 Replies)
HI,
I have a directory structure. /abc/def/ghi/
I want to store it into array.
So that if I do a pop function on that array I can easily go to previous directory.
But how can i split and store it.
@Directory = split(/\//,$DirectoryVarialbe)
That doest works. Any other escape sequence... (5 Replies)
Hi,
I am writing a Perl script that reads in many lines, if a line meets the criteria I want to edit, it. For example, the script will return the following example line... test=abc123
All I want to do is strip off the "test=" and just be left with the abc123. In my script I can easily... (3 Replies)
Hi All,
How to remove a box like special character which appears at the end of a string/line/record. I have no clue what this box like special character is. It is transparent square like box. This appears in a .DAT file at the end of header.
I'm to compare a value in header with a parameter.... (16 Replies)
Hi
just for regular use i m working on small module written in perl for getting date in specified format like i have to specify date format and then seperator to seperate date i am 95% done. now i m sure explanation i gave is not good enough so i am putting output here :
C:\Documents and... (2 Replies)
All I'm trying to split a string at the $ into arrays
@data:=<dataFile>
a $3.33
b $4.44
dfg $0.56
The split command I have been playing with is:
split(/\$/, @data)
which results with
a .33 b .44 dfg .56
any help with this is appreciated
/r
Rick (9 Replies)
Hi,
I am beginner to Shell Scripting.
I have a String like this "testabcdef", i need the first character as it is and the remaining character should be replaced by the the '*' character. e.g(t***********)
PLZ Suggest me. (5 Replies)
Hello,
I was trying to split a string to characters by perl oneliner.
echo "The quick brown fox jumps over the lazy dog" | perl -e 'split // ' But did not work as with bash script pipe:
echo "The quick brown fox jumps over the lazy dog" | fold -w1 | sort | uniq -ic 8
1 T
1... (6 Replies)
Hi.
I have 2 files of below format.
File1
AA~1~STEVE~3.1~4.1~5.1
AA~2~DANIEL~3.2~4.2~5.2
BB~3~STEVE~3.3~4.3~5.3
BB~4~TIM~3.4~4.4~5.4
File 2
AA~STEVE~AA STEVE WORKS at AUTO COMPANY
AA~DANIEL~AA DANIEL IS A ELECTRICIAN
BB~STEVE~BB STEVE IS A COOK
I want to match 1st and 3rd... (2 Replies)
Discussion started by: crypto87
2 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)