Hi,
I am trying to write a script that will move all the files from source directory structure(multiple levels might exist) to destination directory structure. If a sub folder is source doesnot exist in destination then I have to skip and goto next level. I also need to delete the files in... (4 Replies)
Hi there,
I was wondering if someone can help me with this.
I am trying the combine multiple columns from multiple files into one file.
Example file 1:
c0t0d0 c0t2d0 # hostname vgname
c0t0d1 c0t2d1 # hostname vgname
c0t0d2 c0t2d2 # hostname vgname
c0t1d0 c0t3d0 # hostname vgname1... (5 Replies)
Hello everybody,
I have a text file containing 10,000 rows and 5000 columns. The values are separated by a tab.
Ex.
file_ex.ped
1 mike 0 0 2 1 A A G G C T A G
1 jack 0 0 2 2 T A G T C A A C
1 Mary 0 0 1 2 A T G C A T G C
...
I would like a out put file
1 mike 0 0 2 1 AA GG CT AG
1... (7 Replies)
Hi Guys,
I want to combine 2 files and and put together in 1 file and make two columns out it. See below desired output. Any help will be much appreciated.
inputfile1.txt
12345
67890
24580
inputfile2.txt
AAAAA
BBBBB
CCCCC (11 Replies)
This may seem obvious but I am having problems doing this as columns get converted to rows when i try to write a script.
I have 2 files text1.txt and text2.txt each of which have 6 columns of numbers separated by a space.
I need to combine the 2 files so that the output file text3.txt maintains... (2 Replies)
Hello everyone,
I searched the forum looking for answers to this but I could not pinpoint exactly what I need as I keep having trouble.
I have many files each having two columns and hundreds of rows.
first column is a string (can have many words) and the second column is a number.The files are... (5 Replies)
Need some help with this ... please
60644,NJ090237_0263_GRP,NJ090237_0263_VIEW,NJ090237_0263_PSGRP,NJ090237_0263_GOLD_CSGRP,,06E:0_08E:0_09E:0_11E:0,0CE5,TDEV,34,VP_TIER... (3 Replies)
i use the split command to split a one terabyte backup file into 10 chunks of 100 GB each. The files are split one after the other. While the files is being split, I will like to scp the files one after the other as soon as the previous one completes, from server A to Server B. Then on server B ,... (2 Replies)
Discussion started by: malaika
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)