Hello Everyone
Im planning to make a C program to check a proxy server if it is working or bot, test the proxy speed ,response time , as well as a proxy type.
i'm learning using libcurl right now to fetch http headers. do you guys have some links about how to check proxy headers?. Thank you.
... (0 Replies)
Well I have a 3000 lines result log file that contains all the machine data when it does the testing... It has 3 different section that i am intrsted in
1) starting with "20071126 11:11:11 Machine Header 1"
1000 lines...
"End machine header 1"
2) starting with "20071126 12:12:12 Machine... (5 Replies)
Hi
I want the user to enter a date in the format 16-APR-2000 .
I need to put validations for that in my script ..
Please help
Thanks and Regards
Ultimatix (1 Reply)
Use and complete the template provided. The entire template must be completed. If you don't, your post may be deleted!
1. The problem statement, all variables and given/known data:
When "niuspell" is invoked from the command line it reads "file" and checks it for spelling of the words it... (1 Reply)
Guys I am new to Linux in general and want to know what is the use of the following files-:
/usr/share/dict/words
/usr/share/dict/words.pre-dictionaries-common
Are they used by the spell checker to find potential typos ?
If so are there any better larger word lists out there ? I am sure... (2 Replies)
Hi Gurus,
I have requirement to compare current result with previous reuslt.
The sample case is below.
1 job1 1
1 job2 2
1 job3 3
2 job_a1 1
2 job_a2 2
2 job_a3 3
3 job_b1 1
3 job_b2 2
for above sample file, GID is group ID, for input line, the job run... (1 Reply)
hi ,
Let me put it in a different way with words.
Assume the lottery have numbers from 1-50.
Out of this 50 numbers, I am going to pick up only 35 numbers randomly.
so, my total numbers would be 35 numbers shuffled from nos.
I have list of winning numbers in file.
Now, the... (9 Replies)
Discussion started by: gsiva
9 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)