06-02-2010
10 More Discussions You Might Find Interesting
1. UNIX for Dummies Questions & Answers
Dear All ,
Kindly note I have sun solaries 7 .
I want to block a domain who keep sending emails to my domain and users .
thanks (1 Reply)
Discussion started by: tamemi
1 Replies
2. IP Networking
I'm in highschool. They blocked my favorite site. How do I disable websense without getting caught on that particular webpage? Is it even possible? *twitch* I would also like to get as much UNIX for beginners information, so if someone might point me in the right direction so I don't have to read... (1 Reply)
Discussion started by: Satine
1 Replies
3. IP Networking
I've got a legit DHCP server on my network. I've got a 3550 as my VTP server providing 4 vlans to 4 2950 switches. If somebody were to plug into one of those vlans with a DHCP server configured then it would throw off my whole network. How could i block the DHCP server that could plug into the... (2 Replies)
Discussion started by: byblyk
2 Replies
4. Shell Programming and Scripting
Hi!!
I have a problem reading from a fifo pipe in shell script.
The idea is simple, I have a C program with two pipe files:
An input pipe I use to send commands in shell script to the C program (echo "command" > input.pipe)
An output pipe that I read the result of the command also in... (4 Replies)
Discussion started by: victorin
4 Replies
5. Shell Programming and Scripting
Hello,
Would this be an acceptable way of creating a non-blocking pipe.
Basically I want to create kind of a server client arch.
This code would be in the server, and I don't want to have to wait for
clients to read before moving on to the next client. One problem I
can see is if... (4 Replies)
Discussion started by: cdlaforc
4 Replies
6. UNIX for Advanced & Expert Users
Hi Folks
I have been debugging a script that is called every thirty seconds. Basically it is doing a ps, well two actually, one to file (read by the getline below) and the other into a pipe. The one into the pipe is: -
V_SYSVPS=/usr/sysv/bin/ps
$V_SYSVPS -p$PIDLIST -o$PSARGS... (0 Replies)
Discussion started by: steadyonabix
0 Replies
7. Programming
OS : solaris 10 X86
I created stream socket, tries to connect to port 7 on the remote machine.
After doing the non blocking connect call I did select with time out value is 3 secs. I am always getting timed out though I am writing prior to select.
code:
x=fcntl(S,F_GETFL,0);... (1 Reply)
Discussion started by: satish@123
1 Replies
8. Shell Programming and Scripting
Hey all. I am trying to write some scripts and need some assistance.
One:
I already have a script that appends lines to a file. I need a script that will remove those lines from that file, and have no idea how to go about doing this. Just need the command (if any) that can remove lines.
... (2 Replies)
Discussion started by: Dysruption
2 Replies
9. IP Networking
Hi
I am starting to practice nmap for my own education.
Now I created two host in virtual box.
Bot are scientific linux, one in installed as web server and the other as developing station.
I tried to run nmap on so I did nmap on their IP address, I got an answer that ip is down or that... (8 Replies)
Discussion started by: programAngel
8 Replies
10. Programming
among the below socket programming api's, please let me know which are blocking and non-blocking.
socket
accept
bind
listen
write
read
close (2 Replies)
Discussion started by: VSSajjan
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)