This is my .bashrc file, feel free to use it all or parts of it in your own .bashrc file. If you have any improvements, let me know. This is for an Ubuntu system, but it could work on any system with some tweaking.

bashrc.sh

# prefix
export PS1="\[$(tput setaf 7) $(tput setab 1)\][\@]\[$(tput bold)\] [\u@\H: \w] # \[$(tput sgr0)\]"

# environment variable
export PATH=$PATH:$HOME/bin/

# remove duplicates from history
 export HISTCONTROL=ignoreboth

# colors
 export TERM=xterm-256color
 export LS_OPTIONS='--color=auto'
 eval "`dircolors -b`"
 alias ls='ls $LS_OPTIONS'
 export GREP_OPTIONS='--color=auto' GREP_COLOR='1;32'

# WWW path
 export WWW=/var/www/

#colored man pages

export LESS_TERMCAP_mb=$'\E[01;31m'
export LESS_TERMCAP_md=$'\E[01;37m'
export LESS_TERMCAP_me=$'\E[0m'
export LESS_TERMCAP_se=$'\E[0m'
export LESS_TERMCAP_so=$'\E[01;44;33m'
export LESS_TERMCAP_ue=$'\E[0m'
export LESS_TERMCAP_us=$'\E[01;32m'


#set Hostname
hostname -F /etc/hostname

# custom shortcuts
 alias ?='history | more'                                       # displays history
 alias c='clear'                                                         
 alias screen='screen -s /bin/bash'     # exec bash on screen
 alias s='screen'                      # one character screen
 alias ss='s -dRR'
 alias ..='cd ..'
 alias update_all='aptitude update && aptitude upgrade'
 alias clean_packages='aptitude clean && aptitude autoclean && aptitude purge'
 alias aptclean='aptitude clean && aptitude autoclean && aptitude purge'

#Custom Functions

function local_ips(){
 ifconfig | grep "inet addr" | awk '{print $2}' | awk -F: '{print $2}'
}

function connected_ips(){
        netstat -lantp | grep ESTABLISHED |awk '{print $5}' | awk -F: '{print $1}' | sort -u
}

function mirror_site() {

        wget --mirror -p --convert-links -P ./ $1
}

function get_links() {
        lynx -dump http://$1 | awk '/http/{print $2}' | sort -u
}

function new_script()
{
        if [ $# -lt 2 ]
        then
                echo -e "ERROR: Not enough arguments\n\nUSAGE: $0 LANGUAGE FILENAME\n\nWHERE:\nLANGUAGE = The language the script will be written in.\nFILENAME = The name of the file to create."
        else
                LANGUAGE=$(which $1)
                FILENAME=$2
                echo "#!$LANGUAGE" > $FILENAME
                chmod +x $FILENAME
                nano $FILENAME
        fi
}