April 21st, 2007 mysurface
I have an experience on using netcat (nc) as telnet client which I would like to share about this discovery. I have heard few of my friends saying, netcat can be a “hacker” tool, it is also known as “Swiss army knife”. It is true, netcat can transform into a server, a various of tcp [...]
Posted in Admin, nc | Hits: 13927 | 1 Comment »
April 4th, 2007 mysurface
There a plenty of linux live cd, check out frozentech.com, scroll down the list and you will see this line:
Currently displaying 315 LiveCD/DVDs
With various tools such as Kadischi, linux live script, Ubuntu Customization Kit etc, you can easily come out your own live cd. What you required is just the matter of time to fine [...]
Posted in Misc, df, fdisk, ls, scp | Hits: 17259 | 12 Comments »
March 26th, 2007 mysurface
ps is a very useful tool to list all current running processes with various info such as CPU usage, memory usage, process status, process id etc.
watch is another good tool to continuously execute some programs in infinite loop. watch allows you to make use of commands such as ps, netstat, lsof into monitoring purpose.
The common [...]
Posted in Admin, ps, watch | Hits: 11363 | 4 Comments »
March 16th, 2007 mysurface
Recently I just discover how to perform ssh reverse tunneling, which is so amazing! I though I know enough about ssh, but ssh is capable of doing more than just connect to a remote server. You can find simple examples of accessing remote server through ssh here.
What is the usage for reverse tunneling?
Let say I [...]
Posted in Admin, Network, ssh | Hits: 11720 | 6 Comments »
March 10th, 2007 mysurface
To write a message to users that have login, you can using the command write. But before that, you need to check who is login, and which terminal he is login to, use command who.
Let say you was unable to call your friend, maybe he forgot to bring his cellphone and you know he is [...]
Posted in Admin, Common, wall, who, write | Hits: 18693 | 18 Comments »
March 8th, 2007 mysurface
To identify and monitor who is running what applications, which the application is listening to what port, established what connections, we can use lsof. lsof (List Open Files) are use for listing all current opened files. Besides the file name, it includes info such as who open it, what command use to open it, what [...]
Posted in Admin, lsof | Hits: 10388 | 2 Comments »
February 28th, 2007 mysurface
Linux can be run on various run level, for run level 0 is shutdown, and run level 6 is restart and usually run level 1 is single user linux.
By default, fedora and red hat will running run level 5 and Ubuntu is running 2. By knowing what run level of your linux distro init, you [...]
Posted in Admin, Misc, runlevel | Hits: 7066 | 1 Comment »
February 28th, 2007 mysurface
netcat, or sometimes the command known as nc capable of doing a lots of thing. The examples of how to use nc to scan open ports showing here.
Here, using netcat to initiate a private chat, we need a listener server with open port and a client connect to the listener server.
Listener: (IP: 192.168.1.1)
nc -l 5678
-l [...]
Posted in Admin, nc | Hits: 9439 | 6 Comments »
January 31st, 2007 mysurface
Putty is a great ssh client for windows user, it is easy to use and lightweight too. Do you expect to see a tutorial or an examples on how to use in windows? No way, it is too many of them, the tutorial is everywhere on the net, google it and i find this.
So, what [...]
Posted in Admin, putty, ssh | Hits: 11289 | 2 Comments »
January 28th, 2007 mysurface
zssh, ZModem ssh, an alternative way to ssh and scp? To perform file transfer and ssh in ordinary way you need ssh and scp.
Conventional way, let say you want to download certain files from a root directory of a server which you do not sure where is the actual location.
First you login to the [...]
Posted in Admin, Misc, scp, ssh, zssh | Hits: 12511 | 3 Comments »
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