Hiiii Friends
I have 2 files with huge data. I want to compare this 2 files & if they hav same set of vales in specific rows & columns i need to get that value from one file & replace it in other.
For example: I have few set data of both files here:
a.dat:
PDE-W 2009 12 16 5 29 11.11 ... (10 Replies)
I have four files, I need to compare these files together.
As such i know "sdiff and comm" commands but these commands compare 2 files together. If I use sdiff command then i have to compare each file with other which will increase the codes.
Please suggest if you know some commands whcih can... (6 Replies)
hi Friends
need to compare columns in one file where the data looks like below
laptop,IBM
phone,samsung
car,rental
user1,laptop
user2,laptop
user3,phone
want to get output as
laptop,IBM
phone,samsung
car,rental
user1,IBM
user2,IBM
user3,samsung
need to seach $2 in array of $1 and... (4 Replies)
Hi,
I'm running a shell script to do a daily backup of my mysql database. The backup is done using:
mysqldump db1 > db1.sql --user=rootuser --password=rootpassword && \
mysqldump db2 > db2.sql --user=rootuser --password=rootpassword
This file is saved in my root directory replacing the... (7 Replies)
Hi All,
I have written a shell script that creates a backup of my MySQL database. The script performs the following functions:
Creates a Backup of the MySQL database
Compresses the Backup
Copies the Backup to a Remote Server
Send an E-Mail displaying the size of the Backup
Removes any... (6 Replies)
Hi All,
I have 2 files in the following format :
File 1
S00999999|BHANU|TEST|007 JOHN DOE APT 999||VENGA HIGHWAY|MA|09566|SCO DUAL|20140201|20140331|20140401|20140630|20140327|
S00888888|BU|TES|009 JOHN DOE APT 909||SENGA HIGHWAY|MA|08566|SCO... (1 Reply)
I need a way to to check if a value in a file that has this XML format is less than or equal to current system date/time. if it is I need to override it with a future date/time:
Here is the data sample:
<?xml version="1.0"... (1 Reply)
Hello,
I have two text tab delimited files
File 1 has 30 columns. I am pasting only first 9
Chr Position Ref Alt Score Gene HGVS_C HGVS_P Coding_Consequence dbSNP
1 17312743 C T 1 Gene1 - ... (2 Replies)
Discussion started by: nans
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)