Hello -
I've serached the web but can't find much on array script variables (except that C-shell variables are arrays!)
I'm trying to form a 2-D string array: (this is what I want, but in java)
String list = { {"one", "two"}, {"three"} };
I know this is a 1-D string array shell... (4 Replies)
Hi.
I am reasonably new to awk, but have done quite a lot of unix scripting in the past. I have resolved the issues below with unix scripting but it runs like a dog. Moved to awk for speed and functionality but running up a big learning curve in a hurry, so hope there is some help here.
I... (6 Replies)
Hi all
I have a file that i'm running and exec(cat ./dat) against..and putting its contents into any array, then doing an exploding the array into a multi-dimension array...
The 15 multi-dimensional arrays have elements that are null/empty, I would like to remove/unset these elements and then... (2 Replies)
Hello,
I have two files in the following format;
file1:
A B C D
E F G H
I J K L
file2:
1 2 3 4
5 6 7 8
9 10 11 12
I have read them both in to multi-dimensional arrays. I need a file that has column 2 of the first file printed out for each column 3 of the second file ie...
... (3 Replies)
I cant get out of this while loop at the beginning of my program. Just reading from stdin one char at a time and storing it into a multi-array. Need to fix it with in two hours.
#include <sys/wait.h>
#include <stdio.h>
#include <stdlib.h>
#include <sys/types.h>
#include <unistd.h>
#include... (1 Reply)
I have an array of names. Each one of the name, has a number represented to it.
For example A has an ID 8, B has an ID 2.
What I am after is a for loop that when the array is in position 1, a particular variable is set to the value of position 1 in array 2
declare -a arr=("A" "B" "C"... (6 Replies)
Hi, I'm developing a script which contains a multi dimensional array, however for some reason the array is not iterating.
When executing the script, services are listed as arguments from argument 2. Ex voice data sms.
service=${@:2};
for services in $service
do
... (2 Replies)
Discussion started by: nms
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)