Ubuntu-TiPs

1.Virtual CD/DVD Drive
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sudo add-apt-repository ppa:cdemu/ppa
sudo apt-get update
sudo apt-get install gcdemu cdemu-client

2.Disable CDROM autoclose
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Temporarly
$ sudo sysctl -w dev.cdrom.autoclose = 0
Permenant
Create file  /etc/sysctl.d/60-cdrom-autoclose.conf and add lines
dev.cdrom.autoclose=0

3.Change button layout to right side
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#gsettings  set  org.gnome.desktop.wm.preferences  button-layout  :minimize,maximize,close

4.Disable GDM Userlist
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$ sudo gconftool-2 --direct --config-source xml:readwrite:/etc/gconf/gconf.xml.mandatory --type Boolean --set /apps/gdm/simple-greeter/disable_user_list True

5.Enable /var/log/messages in Ubuntu 12.04
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Edit the /etc/rsyslog.d/50-default.conf file (Enable line which contain /var/log/messages line)

6.Enable Arrow Keys in Vi Edit mode
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Change the “set” variable in “/etc/vim/vimrc.tiny” file from compatible to nocompatible
# vi   /etc/vim/vimrc.tiny 
set  nocompatible

7.To Chage the PS1 Variable in bash Prompt:
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Edit the PS1 variable in the “/home/$USER/.bashrc” file if exist   or    “/etc/bash.bashrc”  file 
as follows  \[\e]0;\u@\h: \W\a\]${debian_chroot:+($debian_chroot)}\u@\h:\W\$

8.Install Malayalam Fonts in ubuntu
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Install ibus first.
$sudo apt-get install ibus
Install the m17n library which holds the indic fonts (includes good old malayalam).
$sudo apt-get install ibus-m17n m17n-contrib
Go to System ▸ Preferences ▸ Ibus preferences
Take the ‘input method’ tab.
From the drop down menu select an input method, choose malayalam ▸ swanalekha and then click on add.
Open up a text editor, hit ctrl+space to change the language and type away.

9. Adibe-Flash-Plugin
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# apt-get install flashplugin-installer
# apt-get install adobe-flashplugin

10.Check Default Display Manager
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$ cat /etc/X11/default-display-manager 

Reconfigure-LightDM
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$ sudo dpkg-reconfigure lightdm

11.Scan a network For running Machines
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# nmap -sP 192.168.1.0/24

To scan all your devices/computers for open ports ever
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# nmap -T5 192.168.1.0/24

12.Disable-Overlay-ScrolBar
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# gsettings set com.canonical.desktop.interface scrollbar-mode normal

13.Disk Usage by Excluding two Directories
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# du -sh /* --exclude /run --exclude /proc|sort -h

14.Exclude /proc,/run&/var directories from Find 
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# find / -path '/proc' -prune -o -path '/run' -prune -o  -path '/var' -prune -o -name test.txt

15.Allow Desktop Sharing on Ubuntu
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# vino-preferences

16.Java-Plugin--On UBnutu
--------------------------------------------# apt-get install default-jre
# apt-get install icedtea-plugin  ---For Browser

Test Java Version----https://www.java.com/en/download/installed.jsp