Prevent connection drops on a ssh connection

Here is two ways to stop connection drops.

modify /etc/ssh/sshd_config file.
add following:

ClientAliveInterval 30
ClientAliveCountMax 5

and restart sshd:

/etc/init.d/ssh restart

OR

modify /etc/ssh/ssh_config

ServerAliveInterval 15
ServerAliveCountMax 3

colorful ls

I was looking for a way to distinguish files and folders. It is set to non-colorful in gnome konsole I'm using.
And I find out a more generic way to overwrite a command's behavior.
Here is how to make your ls colorful:
alias 'ls=ls --color=auto'

Can't enable wireless on Linux

I keep getting error, saying "wireless disabled" on my Dell XPS 1330 laptop.
Then I realized it is hardware disabled...

#rfkill list
>> 3: phy0: Wireless LAN
>> Soft blocked: no
>> Hard blocked: yes

Way to solve this problem is
#sudo rmmod dell_laptop
--enabling it back:
#sudo modprobe dell_laptop

how to change command line editor

here is how to change command line editor in Linux.
set -o vi
set -o emacs

click for more detailed guidance on shell options.

How to Increase Heap Space of a Project in Eclipse

Right click source code of the class where your main function is. Then select Run As and Run Configurations. Choose the "Arguments" tab and indicate how much memory you wanna allocate in the VM arguments part. eg: -xmx128m
here is a screenshot:



Also, you can find descriptions of other parameters on this webpage.