Hello,
i have a directory;say /home/pavi
i has some files and every day files keep adding to it.
i am writing a shell script which copies all the files from this
directory to another.say /home/tom/tmp
how do i copy all the files from /home/pavi to /home/tom/tmp
all the files in the... (1 Reply)
This is my first post, so first I'd like to say hello to everyone.
Here's the issue I'm having...I run a macro against multiple log files every morning. The procedure is sort of time consuming. I have to log into the box where there are stored, then ftp/download them to my local drive using... (3 Replies)
Hi,
I'm trying to copy the directories from one location(/tmp/source/) to other(/tmp/dest/).
for this I have written a PERL script.
snippet of code
$sourcePath = "/tmp/source";
$destPath = "/tmp/dest";
opendir(DIR, $sourcePath );
while($dir = readdir(DIR))
{
if($dir ne "." && $dir ne... (1 Reply)
I have two directories that contain data files. I would like to create a script that would copy all data files (*.dbf) from these directories to another location, except for 4 specific files.
How do I exclude those files from my cp command? (4 Replies)
Hi,
we have file name appended by date in yymmdd format .. ex: abc090101.dat
I need to copy all the files between abc090101 to abc090331..
could you plz help me..
Thanks. (1 Reply)
hey all,
i have a unix computer and a windows os computer connected in the same local network
i want to copy the etc folder to the windows computer so if my unix computer's hard disk rashes i can restore it from my windows computer.
my first problem is i'm kinda lame with unix...i know... (3 Replies)
Hi,
I need to delete all files, in a folder, older than 2010 that is 2009, 2008 ,.. files...
Can anyone suggest the command for that,...
Thanks
---------- Post updated at 03:29 PM ---------- Previous update was at 02:53 PM ----------
humm,.. ok right now I am using the following:... (4 Replies)
hi All, Any one answer my requirement.
I have source location
src_dir="/home/oracle/arun/IRMS-CM"
My Target location
dest_dir="/home/oracle/arun/LiveLink/IRMS-CM/$dc/$pc/$ct"
my source text files check with below example.text file content
$fn "\t" $dc "\t" $pc "\t" ... (3 Replies)
Discussion started by: sravanreddy
3 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)