Hi ,
I have file named docs.txt
The content of the file look like this:
DOC disk location Size
======= ===== ============= =========
TXT A /dev/dm-1 10
TXT B /dev/dm-2 10
BIN C ... (3 Replies)
hey... i had a big problem with my professor
i have 3 simple archives
in.txt -> had all timestamps of users logon (100lines)
ex. 111111
222222
333333
out.txt -> had all timestamps of users logof (100lines)
ex. 111113
222225
333332
commands.txt... (9 Replies)
A file whose location i am not aware of contains the below text
<url>jdbc:oracle:thin:@(DESCRIPTION=(ADDRESS_LIST=(FAILOVER=on)(ADDRESS=(PROTOCOL=TCP)
(HOST=ngm2sn1p2-vip.mybank.net)(PORT=4001))(ADDRESS=(PROTOCOL=TCP)(HOST=ngm2sn2p2-vip.mybank.net)... (1 Reply)
Hi All,
File1.txt
File2.txt
Above are the two input file's:
Always I use to get three rows for File1.txt
File1.txt (fixed width) 2nd line i will get date and 3rd record i will get a number.
File2.txt (Pile delimeter) will contains 'n' number of records were header & footer is... (4 Replies)
i have a requirement to search a pattern1 and once the pattern1 is found i have to go up and search pattern2 and if pattern2 is found i have to search down for pattern3 and pattern4. once this cycle is compelted, again i have to search pattern1 and pattern2,3,4
i am able to do this by opening... (9 Replies)
Hi,
I have a file. In this file when ever the word "ABC" occurs at position from 25 and 34 I would like to replace
the value at postion 100 to 5 for the first 1000 rows only.
I have written the following Awk command.
nawk 'substr($0,25,9)=="ABC" {print $0}' filename
The above command... (4 Replies)
If I need the output as below, what syntax I should use. I use only korn shell.
=========In file ===========================
#!/usr/bin/ksn
P1=cat
P2=dog
P3=bat
for i 1 2 3
do
echo $P$i # <---------- This line is the problem I face. What I should use.
done
========= End of file... (5 Replies)
Discussion started by: kkakarot
5 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)