Hi mates,
i am trying to run a shell command from my C program in this case let is say the "ls" command. It copiles it okay, and even creates the new fork too. But seems to nothing is happening i mean it is not showing the result of the "ls" command.
I don't know wat i am doing wrong. Any... (1 Reply)
Here is some sample PHP code you can run if you have a PHP web application that uses code or images from an ad server, image server, or content deliver network, and you want to check if it is working and if not, failover to another one:
<?php
$current_server = "server.domain.com";
// set... (0 Replies)
I have a code block which sends a mail using Mail::Sender. Everything works great now. I just want to know how to check whether the status of sending mail is success or failure. Based on which I will log the result in my log file.
How can I do this? Any idea please? (2 Replies)
Hi,
I've a find command like,
find /abcd/efgh -name "xxxx" 2> /dev/null > file1
what would be the condition to check if this returns none(means if the file "xxxx" is not present) ????
I tried checking with $? and it returns 72 to me but even the file is present also it returns... (6 Replies)
Hi Guy’s,
I have this simple PERL code which checks whether the file exists . At the moment I am getting the following error
This is the code I am using
#!/usr/bin/perl
Open (F, "home/work/PerlWork/dataFile") or die "Could not open the file:$!\";
Also how can I read the content of... (3 Replies)
Hi Experts,
I am checking how to get day in Perl.
If it is “Monday” I need to process…below is the pseudo code.
Can you please prove the code for below condition.
if (today=="Monday" )
{
while (current_time LESS THAN 9:01 AM)
... (1 Reply)
hello
check this script it jump to else part, in n both cases,
(if files exist or not)
wget $MIRROR/kkk.zip && wget $MIRROR/jjj.zip
RC="$?"
if ]
then
echo -e "$RED Ooops, Download links are broken...! $RESET"
else
echo -e "$GREEN Everything is fine, Cheers ... $RESET"
fi (4 Replies)
Hi
I need to have a piece of code that check if all file systems are mounted or not.
I have to pieces of information like the output of the bdfcommand, and the file /etc/fstab.
The first is:
bdf
Filesystem kbytes used avail %used Mounted on
/dev/vg00/lvol3 2097152 266656... (3 Replies)
Discussion started by: fretagi
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)