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showing and monitoring processes

To install: sudo apt-get install xclip

xclip id_rsa.pub should copy the content into primary selection. To copy into clipboard, follow the command with xclip -o | xclip -sel clip

Add alias for cd to folder

alias shortcutname="cd /c/target/directory" 

add the command on your .bashrc. Next time you can just run commannd shortcutname to change the directory to c/target/directory.

Add symbolic link

 sudo ln -s <src-path> <dest-path>

Remove symbolic link

 rm <dest-path>

apt-cache policy <package-name> More useful commands using apt-get

Using apt-get

sudo apt-get install package-name

Using .tar.xz file

1. download .tar.xz file.

Using .deb file

1. download .deb file.
2. run command sudo dpkg i <file.deb>
3. if errors outs due to dependencies, run command sudo apt-get install -f and rerun step 2.

sudo apt-get install packagename=2.3.5

1. Download eclipse(*.tar.gz) from its website
2. Make sure you have java installed]()
3. Extract eclipse*.tar.gz into /opt cd /opt && tar -zxvfw ~/Downloads/eclipse*.tar.gz
4. Create launcher shortcut for eclipse, create eclipse.desktop file in /usr/share/applications or ~/.local/share/applications and add following contents.

[Desktop Entry]
Name=Eclipse 4
Type=Application
Exec=/opt/eclipse/eclipse
Terminal=false
Icon=/opt/eclipse/icon.xpm
Comment=Integrated Development Environment
NoDisplay=false
Categories=Development;IDE;
Name[en]=Eclipse

5. create symbolic link to open an eclipse from command line

 sudo ln -s /opt/eclipse/eclipse /usr/bin

or use update-alternatives

sudo update-alternatives --install /usr/bin/eclipse eclipse /opt/eclipse/eclipse

Setting your environment variables

Installing nodejs.

Installing various packages into unbuntu

Installing oracle java

Installing Mongodb

#####Where are package installed

Directory structure Explained

Linux Filesystem Hierarchy

Directory Map

Linux Directory Map

Add daemons services