Hello,
I need to create 100kb,1000kb,10000kb etc files of no particular substance but I need them a exact size.
I think they are .dat's I need but im unsure of the command I issue to create them
Any help appreciated :)
Mr Pink (4 Replies)
Hello - I am finding difficulty in creating and allocating correct size to File Systems on solarix x86 box. Please see below contents I followed on screen and in the end It shows that /app file system is created of size 135GB , I wanted it to be 30gb as mentioned during 'format' command in 'Enter... (7 Replies)
I have a file that has dates like this:
date FINAL_RESULT; 7
date FINAL_RESULT; 2
date FINAL_RESULT; 5
With this command: seira=`cut -f2 -d\; tes.txt` i take the date FINAL RESULTs and i store them on variable seira.then seira look like this: 6 3 8
I want to read seira and make a sum of all... (4 Replies)
Hi all,
I would like to ask on how to create 2MB partition on a Compact Flash card. It supposed to be of FAT12 type, and the CF capacity is 4GB. I try to do the partitioning and specify the size as 2MB but the partition editor automatically resize it to 8MB. I know that this is possible and the... (4 Replies)
Hi
I am new to shell scripting.I want to create a batch file which creates a desired number of files with a specific size say 1MB each to consume space.How can i go about it using for loop /any other loop condition using shell script?
Thanks (3 Replies)
Good morning!!
Im trying to create a script that should get a list of numbers from the user (using STDIN or a list of arguments), and call my library function.
#!use/bin/perl
require 'my-lib.pl';
@userArray = <STDIN>;
while()
{
chomp;
last if ! /\d/;
push(@userArray,&_);
}... (2 Replies)
Hello world,
I just learnt we can create a directory with custom size in a Linux server (say Redhat). Is it true? I'm asking because the only data (I can think of) a directory's inode holds is the files and 'sub-dir's. How can a new empty directory be of some required size? :wall:
PS : In... (2 Replies)
Hi guys
I am performing a simple test for a blank string with the following code:
if ] ]] ; then
echo "Blanks are NOT a valid input "
return 1
fi
The above fails giving a syntax error message:
syntax error at line 142 : `=~' unexpected
I am in ksh88
is there... (2 Replies)
how can i insert a string sush as "###" instead of blank lines in a file?
i try this code but it doesn't work!
awk 'NF<1 {$1=="###" ; print$0}' in_file > out_file (13 Replies)
Hi,
I am creating a shell script which will check the processing of the main script if the error count is more than 2% of the record count in a feed. Part of the code is below:
err_tol=`echo $feed_cnt \* 0.02 |bc`
while read line
do
err_cnt=$(grep -i "$line" $err_log | wc -l)
... (5 Replies)
Discussion started by: member2014
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)