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.