Useful when you have some wrong on a server (nfs freeze/ immortal process)

The command could show you all conecctions if you skip "grep ESTABLISHED"

Create a bunch of random files with random binary content. Basically dd dumps randomly from your hard disk to files random-file*.

Query Wikipedia by issuing a DNS query for a TXT record. The TXT record will also include a short URL to the complete corresponding Wikipedia entry.You can also write a little shell script like:

and run it like

were your first option ($1) will be used as search term.

Display the amount of memory used by all the httpd processes. Great in case you are being Slashdoted!

A simple "ls" lists files *and* directories. So we need to "find" the files (type 'f') only.

As "find" is recursive by default we must restrict it to the current directory by adding a maximum depth of "1".

If you should be using the "zsh" then you can use the dot (.) as a globbing qualifier to denote plain files:

zsh> ls *(.) | wc -l

for more info see the zsh's manual on expansion and substitution - "man zshexpn".

works on Linux and Solaris. I think it will work on nearly all *nix-es

The initial version of this command also outputted extra empty lines, so it went like this:

192.168.166.48

127.0.0.1

This happened on Ubuntu, i haven't tested on anything else.

slashdot.org webserver adds an X-Bender or X-Fry HTTP header to every response!

Open a ssh session opened forever, great on laptops losing Internet connectivity when switching WIFI spots.

Due to the recent dynamic update vulnerability with bind, I was forced to dig a little deeper into dig...

Get details about an ISO image , without burning it or mounting it .

bnd-ips.txt is a list of IP adresses that is concenated for use as regular expression. Yes, this is still very speedy ;=)

use find to grep all .c files from the target directory, cat them into one stream, then piped to wc to count the lines

The command `cat file >> file` failes with the following error message:

cat: file: input file is output file

`tee` is a nice workaround without using any temporary files.

This will launch and irssi session on your server. If it's not running, it will create the session. If it's running it'll connect to it and destroy any other connections. If compositing is available, the rxvt window will have transparency added. This window will also open maximized. Anything else this does should be easily figured out in the man pages.

On a Gentoo system, this command will tell you which packets you have installed and sort them by how much space they consume. Good for finding out space-hogs when tidying up disk space.