Facing problem with X11

I've faced some problem with X11 forwarding. Then I analsyed the X process using ps -ef | grep X

I found the X process initialized has the argument--nolistentcp. Actually this prevents the tcp connection for X11. So make sure this is disabled in gdm.conf.

I came to know there is a entry in /etc/X11/gdm/gdm.conf which prevents the TCP connection.

after altering the "DisallowTCP"=false.

and restart the X windows.

To restart X windows CRTL + ALT + backspace or restart the system.

This made my totem movie player works

Struggled a long to make my totem player work, finally the ubuntuforumn gives a break,

Below is the apt-get I ran,

sudo apt-get install ubuntu-restricted-extras

To find opened ports in linux

After a long search I found the good way to search the opened ports in a machine.
It's nmap & netstat.

Syntax

netstat -na | grep 6000

nmap -p 1-63335 localhost

The above command displays the ports opened in machine localhost.

Mastering VI

D	To delete remaining characters under cursor in current line.
dd	To delete entire line and copy to clipboard
$	Move the cursor to the end of the current line.
C-g	To display filename and number of lines in end of the terminal
r	To replace single character under cursor
R	To replace multiple character under cursor untill escape is pressed
dw	To replace a word under cursor

Mastering Bash

C-a	Move the cursor to the beginning of the input line.
C-d	Same as [DEL] (this is the Emacs equivalent).
C-e	Move the cursor to the end of the input line.
C-k	Kill, or "cut," all text on the input line, from the character the cursor is underneath to the end of the line.
C-l	Clear the terminal screen.
C-u	Kill the entire input line.
C-y	Yank, or "paste," the text that was last killed. Text is inserted at the point where the cursor is.
C-_	Undo the last thing typed on this command line.
[←]	Move the cursor to the left one character.
[→]	Move the cursor to the right one character.