While using semget function we use the flag 0777 | IPC_CREAT or IPC_CREAT |0666 . What is the significance of these numbers and the order in which they are written ? (1 Reply)
Hi All,
I've written a shell script in which i defined two varibles
for example:
str=1.0.0.15
timeStamp=2008.03.08
now using this varibles i need to modify a text file.
The text content looks like this
************************
* packageNumber : 1.0.0.14 *
* date :... (2 Replies)
Hi Guys,
I'm new to this forum as well as to UNIX shell scripting.
I'm looking for a shellscript to query an Oracle database table and populate the result set of the query in a text file.
Could you someone help me out with a sample code?
Thanks,
Bhagat (7 Replies)
I am in a dire need of doing this job , please help from shell script or perl script. It will be highly appreciated.
Please have a look at the following INPUT file;
The first 14 rows are not of interest but I want them to be included in the output file as they are. From the row 14... (3 Replies)
Hi,
Is there any way that mysql query reads the content from a text file which has data in the below format:
1,2,3,4,5
and selects matched data from another table.
ie I have a table named xyz which has same ids as in that file.
I want this query to get count of the ids from xyz file by... (6 Replies)
Hi Experts,
I have a text exactly like below in a file:
id item_id
item_date prin_mkt_val
--------------------------- ---------------------------
------------------------------- ------------------------
... (1 Reply)
Hi. I've tried several different programs to try and solve this problem, but none of them seem to have done exactly what I want (and I need the file in a very specific format). I have a large file of DNA sequences in a multifasta file like this, with around 15 000 genes:
... (2 Replies)
Hello,
I have some text data that is in the form of multi-line records. Each record ends with the string $$$$ and the next record starts on the next line.
RDKit 2D
15 14 0 0 0 0 0 0 0 0999 V2000
5.4596 2.1267 0.0000 C 0 0 0 0 0 0 0 0 0 0 0 ... (5 Replies)
I would like to call a .sql file from a .sh file in linux. The .sql file will contain queries to MySQL database.
I am able to call the .sql file by running .sh file in linux, but the sql query is not working. Below is my syntax. The select statement is throwing below error.
./sample.sql: line... (1 Reply)
Discussion started by: qytan
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)
10-19-2012
