Hello All,
I like this forum btw, and have only been lurking for about a day.
Recently I purchased some new hardware (AMD Athlon 64 3200+ and a Asus K8V Deluxe Motherboard), and I want to find an OS that can take advantage of the 64 bit processor.
Basically, what are the differences... (2 Replies)
Hi,
I have written the following two scripts.
a.ksh --->
FPATH=/users/kushard
autoload b
b
echo "From a.ksh::" $aa
b --->
function b
{
typeset aa
aa="TRUE."
echo "From b::" $aa
export aa
} (1 Reply)
Hello all,
I am trying to delete all the lines in a particular file having a pattern. The problem is that it has special characters and for some reason is not doing the job.
For eg.
src_file
/home/test/filelist.txt :xxxx:ogog
/home/test/RCH/ogogogg
/home/test/RYHUJ/HHHH... (3 Replies)
Good day, everyone!
Could anybody explain me the following situation.
If I'm running similar script:
Var="anna.kurnikova"
Var2="Anna Kurn"
echo $Var | tr -t "$Var" "$Var2"
Why the output is :
anna KurniKova
instead of Anna Kurnikova?
:confused:
Thank you in advance for any... (2 Replies)
I come across an entry in cron which is in such:
0 * * * *
What is the first 0 indicating? 0 minute? meaning a script cron as such will run every minute? :confused: (2 Replies)
I don't even know where to start with this one. There is so much out there about different aspects of this. I am starting with a basic Ubuntu 11.04 install. Do I need to configure a DNS? I am a little confused about that. What do I need to do for a domain name? I have followed various tutorials,... (1 Reply)
Hello All,
I have a problem in counting number of process getting run with my current script name..
Here it is
ps -ef | grep $0 | grep -v grep
This display just one line with the PID, PPID and other details when i print it in the script.
But when I want to count the numbers in my... (11 Replies)
Hi Seders,
i am new to this forum, but i think it's quite the best place to post.
So, here is my pb :
I have a csv file, with comma separator and text enclosed by ".
First pb is with text in " ......... ", wich sometimes includes lines break, and commas
And to complicate a little more,... (4 Replies)
Discussion started by: yogeek
4 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)