Hello everybody
I have a very annoying problem on my Solaris (Unix in general) servers. When I open a shell and press the backspace button, it results in a ^H character being printed on screen. I can resolve it by typing stty erase <backspace>, but does anyone know how I can prevent the... (3 Replies)
I have to process a data file in Ab Initio. This data file is pipe delimited. BUt the file may have a Disclaimer line at the end. So before picking it for processing, I need to check if this line is there I need to remove it. ANy suggestions.
Thanks
Shalu (1 Reply)
Hi,
I am trying to write a script which would go search and get the info from the logs based on yesterday timestamp and write yesterday logs in new file. The log file format is as follows:
""""""""""""""""""""""""""... (3 Replies)
ok the assignment question:
That English paper you were writing on the works of Lewis Carroll is due in a few hours and you have forgeotten the name of the text file in which you has written a number of quotations to use in your paper. Luckily, you know that the file is somewhere in your... (1 Reply)
Hi All,
Im selecting a large record from a table and putting it in a file in the unix box. The file has a hidden character "^[[D " present in it. Can any one help me in getting rid of the character
Thanks in advance, (4 Replies)
Hi all,
I am new to unix....pls help me with this.
I have a binary file generating output by passing arguments in bash.when i open the output file in VI i can see that ^m is included in between most of lines,as a result when i pass this file to my java application it dosent parse the data... (3 Replies)
I have a text file with hundreds of 32-character hash codes in it, each terminated with a linefeed (/l, or ^M).
185ead08e45a5cbb51e9f7b0b384aaa2
57643e1a17252a9fc746d49c3da04168
60cba11d09221d52aaabb5db30f408a2
2b75ee6e5c2efc31b4ee9a190d09a4df
...... etc.
I want to create a file for each... (6 Replies)
Hi Nigios Gurus
Just a silly question, is there any way that we can see on nagios who's login credential initiated some disable/enable service check? (1 Reply)
We have a dual Nagios server setup. One is setup for internal server monitoring on our LAN, while the second Nagios server is hosted externally and is used for external checks only such as URL and ping checks form the WAN side.
I was wondering if there is any way to setup cross dependencies... (1 Reply)
Appreciate help for the below issue.
Im using below code.....I dont want to attach the logs when I ran the perl twice...I just want to take backup with today date and generate new logs...What I need to do for the below scirpt..............
1)if logs exist it should move the logs with extention... (1 Reply)
Discussion started by: Sanjeev G
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)