I get a lot of questions about my short cuts.  Here is my .bashrc I use so people have some examples of things to do with their profile.  I put a description of what it does in comments (#) so it is easy to understand. I made sure to comment them out so you can just copy-paste this and go with it. I will post updates as I get the urge or requests.

# .bashrc
# Source global definitions
if [ -f /etc/bashrc ]; then
. /etc/bashrc

# This just setups up the colors for you. I stole this from the Red Hat init system

# Define some colors first:
NC='\e[0m'              # No Color
#Some short cut commands I use on a regular basis

# User specific aliases and functions
# The 'ls' family
alias ll="ls -l --group-directories-first"
alias la='ls -Al'          # show hidden files
alias lx='ls -lXB'         # sort by extension
alias lk='ls -lSr'         # sort by size, biggest last
alias lc='ls -ltcr'        # sort by and show change time, most recent last
alias lu='ls -ltur'        # sort by and show access time, most recent last
alias lt='ls -ltr'         # sort by date, most recent last
alias lm='ls -al |more'    # pipe through 'more'
alias lr='ls -lR'          # recursive ls
alias tree='tree -Csu'     # nice alternative to 'recursive ls'
alias h='history'
alias j='jobs -l'
alias which='type -a'
alias ..='cd ..'
alias du='du -kh'       # Makes a more readable output.
alias dk='df -kTh'
alias lot='lsof -i tcp'    #List all open files using tcp
alias lou='lsof -i tcp'    #List all open files using udp
#This should be obvious; but it is the help function I wrote since I forget sometimes what I write

# Functions - Handy functions to have
function helpme()
    echo -e "\n"
    echo -e "\t${BLUE}List of Commands and Aliases$NC"
    echo -e "\n"
    echo -e "\tAliases"
    echo -e "--------------------------------------------------------------------"
        echo -e "${RED}ll$NC    \t\tshow listing with directories first"
        echo -e "${RED}la$NC    \t\tshow hidden files"
        echo -e "${RED}lx$NC    \t\tsort by extension"
        echo -e "${RED}lk$NC    \t\tsort by size, biggest last"
        echo -e "${RED}lc$NC    \t\tsort by and show change time, most recent last"
        echo -e "${RED}lu$NC    \t\tsort by and show access time, most recent last"
        echo -e "${RED}lt$NC    \t\tsort by date, most recent last"
        echo -e "${RED}lm$NC    \t\tpipe through 'more'"
        echo -e "${RED}lr$NC    \t\trecursive ls"
        echo -e "${RED}tree$NC    \t\tnice alternative to 'recursive ls'"
        echo -e "${RED}h$NC    \t\thistory"
    echo -e "${RED}j$NC    \t\tlist jobs"
    echo -e "${RED}..$NC    \t\tcd .."
    echo -e "${RED}du$NC    \t\tmakes format more readable"
    echo -e "${RED}dk$NC    \t\teasier format and more information"
        echo -e "${RED}lot$NC   \t\tList all open files using tcp"
        echo -e "${RED}lou$NC    \t\tList all open files using udp"
    echo -e "\n"
    echo -e "\tCommands"
    echo -e "---------------------------------------------------------------------"
    echo -e "extract <filename>    \t\textract any archive"
    echo -e "change2user <username>    \t\tsudo to a user and setup X for remote display"
    echo -e "change2root         \t\tsudo to root with X display setup for remote export"
    echo -e "lowercase        \t\tmove filenames to lowercase"
    echo -e "killps            \t\tkill process by name"
    echo -e "repeat    <N> <command>    \t\trepeat command N times"
    echo -e "corename <core>    \t\tGet name of app that created a corefile"
    echo -e "ii            \t\tGet information about current host"
    echo -e "\n"
#Command to extract any kind of archive file quick and easy

function extract()      # Handy Extract Program.
     if [ -f $1 ] ; then
         case $1 in
             *.tar.bz2)   tar xvjf $1     ;;
             *.tar.gz)    tar xvzf $1     ;;
             *.bz2)       bunzip2 $1      ;;
             *.rar)       unrar x $1      ;;
             *.gz)        gunzip $1       ;;
             *.tar)       tar xvf $1      ;;
             *.tbz2)      tar xvjf $1     ;;
             *.tgz)       tar xvzf $1     ;;
             *.zip)       unzip $1        ;;
             *.Z)         uncompress $1   ;;
             *.7z)        7z x $1         ;;
             *)           echo "'$1' cannot be extracted via >extract<" ;;
         echo "'$1' is not a valid file"
#The next to are so I can change (sudo) to a user first, root second and export the display

function change2user() #Handy for exporting displays as a different user than the one you logged in as
     echo "Changing permissions on Xauthority file."
     chmod 644 ~/.Xauthority
     echo -n "Getting user shell...."
     NEWUSERSHELL=`ypcat passwd | grep $1 | awk -F: '{ print $7 }'`

function change2root() #Handy for exporting the display when you su - root
     echo "Changing permissions on Xauthority file."
     chmod 644 ~/.Xauthority
     echo -n "Getting user shell...."
     XAUTHORITY=$HOME/.Xauthority DISPLAY=$DISPLAY sudo su -
#I hate uppercase file names; this fix those for me by changing them all to lowercase.

function lowercase()  # move filenames to lowercase
    for file ; do
        case "$filename" in
        */*) dirname==${file%/*} ;;
        *) dirname=.;;
        nf=$(echo $filename | tr A-Z a-z)
        if [ "$nf" != "$filename" ]; then
            mv "$file" "$newname"
            echo "lowercase: $file --> $newname"
            echo "lowercase: $file not changed."
#Kill a process by name quick and easy. No Fuss, no Mess

function killps()                 # Kill by process name.
    local pid pname sig="-TERM"   # Default signal.
    if [ "$#" -lt 1 ] || [ "$#" -gt 2 ]; then
        echo "Usage: killps [-SIGNAL] pattern"
    if [ $# = 2 ]; then sig=$1 ; fi
    for pid in $(my_ps| awk '!/awk/ && $0~pat { print $1 }' pat=${!#} ) ; do
        pname=$(my_ps | awk '$1~var { print $5 }' var=$pid )
        if ask "Kill process $pid <$pname> with signal $sig?"
            then kill $sig $pid
#This was an old command, but gives me my ip (used by one of my firewall scripts)

function my_ip() # Get IP adresses.
    MY_IP=$(/sbin/ifconfig eth0 | awk '/inet/ { print $2 } ' | \
sed -e s/addr://)
    MY_ISP=$(/sbin/ifconfig eth0 | awk '/P-t-P/ { print $3 } ' | \
sed -e s/P-t-P://)
#This gives me my local hosts information. I use this as part of a login script to confirm where I am.

function ii()   # Get current host related info.
    echo -e "\nYou are logged on ${RED}$HOST"
    echo -e "\nAdditionnal information:$NC " ; uname -a
    echo -e "\n${RED}Users logged on:$NC " ; w -h
    echo -e "\n${RED}Current date :$NC " ; date
    echo -e "\n${RED}Machine stats :$NC " ; uptime
    echo -e "\n${RED}Memory stats :$NC " ; free
    my_ip 2>&- ;
    echo -e "\n${RED}Local IP Address :$NC" ; echo ${MY_IP:-"Not connected"}
    echo -e "\n${RED}ISP Address :$NC" ; echo ${MY_ISP:-"Not connected"}
    echo -e "\n${RED}Open connections :$NC "; netstat -pan --inet;
#This just repeats command(s) X times, useful in some situations

function repeat()       # Repeat n times command.
    local i max
    max=$1; shift;
    for ((i=1; i <= max ; i++)); do  # --> C-like syntax
        eval "$@";
#Just used by other functions

function ask()          # See 'killps' for example of use.
    echo -n "$@" '[y/n] ' ; read ans
    case "$ans" in
        y*|Y*) return 0 ;;
        *) return 1 ;;
#This helps you find out what created those core files you find, comes in handy

function corename()   # Get name of app that created a corefile.
    for file ; do
        echo -n $file : ; gdb --core=$file --batch | head -1

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