Hi all,
I am trying to create a file which has one or more ranges based on a file containing a long list. The problem is that the file which has this list is not continuous and is broken in many places. I will try to illustrate by an example:
The List File:
1
2
3
4
5
6
9
10
11
12... (5 Replies)
I have 3 variables with different information.. they look like this (row-wise aswell):
Variable1 =
Roland
Kalle
Dalius
Variable2 =
ake123
ler321
kaf434
Variable3 =
Richardsen
Sworden
Lokthar
How can I sort them by variable3 alphabetical and add them into the same output so... (0 Replies)
Hi all
I'm having a few issues with sorting some data into easily-readable columns.
Original data in file:
Number of visits IP Address
8 244.44.145.122
8 234.45.165.125
6 225.107.26.10
I firstly tried the column -t command which results in this:
Number of ... (4 Replies)
I have a string containing fields separated by space
Example
set sr="Fred Ted Joe Peter Paul Jean Chris Tim Tex"
and want to display it in a column format, for example to a maximum
of a window of 100 characters
And hopefully display some thing like
Fred Ted Joe ... (3 Replies)
Hello Unix experts,
I need a help to create a subset file. I know with cut comand, its very easy to select many different columns, or threshold. But here I have a bit problem as in my data file is big. And I don't want to identify the column numbers or names manually. I am trying to find any... (7 Replies)
Hi all, looking for some help here. I'm what you'd call a dirty programmer. my shell scripts might be ugly, but they (usually) function...
Say I have a single column text file with a list of dates (yyyymmdd) that represent the elevation of a point on that date (I work with land subsidence, so... (2 Replies)
I have 2 files, that look like this:
ID SNP1 SNP2 SNP3 SNP4
A1 1 2 0 2
A2 2 0 1 1
A3 0 2 NA 1
A4 1 1 0 2
and this:
SNP score
SNP1 0.5
SNP2 0.7
SNP3 0.8
SNP4 0.2
Basically, all of the SNP-values are 0,1, 2 or NA, and they each have a score, listed in the second file. The total... (5 Replies)
how do i create a list of every process running on my system and place it into a file lets say p1.txt (1 Reply)
Discussion started by: richiestank
1 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)