This is my .bashrc

# Andi's .bashrc
 
# setup path
export PATH=${HOME}/bin:${HOME}/programs/bin:${PATH}
 
# where's my palm?
export PILOTPORT=/dev/ttyUSB1
 
# be sure to do to all this on interactive shells only
if [ "$PS1" ]; then
 
  # handy file conversion tools
  alias dos2unix="perl -pi -e 's/\r\n/\n/;'"
  alias unix2dos="perl -pi -e 's/\n/\r\n/;'"
  alias bomstrip="sed -i -s -e '1s/^\xef\xbb\xbf//'"
 
  # enable color support of ls and also add handy aliases
  eval `dircolors -b`
  alias ls='ls --color=auto'
  alias ll='ls -l'
  alias la='ls -A'
  alias l='ls -la'  
 
  # color in man pages http://icanhaz.com/colors
  export LESS_TERMCAP_mb=$'\E[01;31m'
  export LESS_TERMCAP_md=$'\E[01;31m'
  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'
 
  # better safe than sorry
  alias cp='cp -i'
  alias rm='rm -i'
  alias mv='mv -i'
 
  # cleanup firefox 3 dbs
  alias ffclean='for f in ~/.mozilla/firefox/*/*.sqlite; do echo $f; sqlite3 $f "VACUUM;"; done'
 
  # set a fancy prompt and xterm title
  shopt -s checkwinsize
  if [ ! -z "$COLORTERM" ]; then
    if [ "$USER" == "root" ]; then
      PS1="\[\033]2;\w\007\]\[\033[0;31m\]\u@\h:\w\\$\[\033[0;37m\] "
    else
      PS1="\[\033]2;\w\007\]\[\033[0;32m\]\u@\h:\w\\$\[\033[0;37m\] "
    fi
  else
    PS1='\u@\h:\w\$ '
  fi
 
  # enable programmable bash completion
  if [ -f /etc/bash_completion ]; then
    . /etc/bash_completion
  fi
 
  # ssh keymanager - see http://wiki.splitbrain.org/ssh
  if [ -e /usr/bin/keychain ]; then
    keychain -q ~/.ssh/id_dsa
    if [ -e ~/.ssh-agent-${HOSTNAME} ]; then
      . ~/.ssh-agent-${HOSTNAME}
    fi
    if [ -e ~/.keychain/${HOSTNAME}-sh ]; then
      . ~/.keychain/${HOSTNAME}-sh
    fi
  fi
  # use zssh if available
  if [ -e /usr/bin/zssh ]; then alias ssh='zssh'; fi
 
  # daily temp dir
  export TD="$HOME/temp/`date +'%Y-%m-%d'`"
  td(){
    td=$TD
    if [ ! -z "$1" ]; then
      td="$HOME/temp/`date -d "$1 days" +'%Y-%m-%d'`";
    fi
    mkdir -p $td; cd $td
    unset td
  }
 
  # twitter client
  twitter(){
    local user='myusername';
    local pass='mypass';
    local twit=`echo -n "$@"`
    if [ -z "$twit" ]; then
        echo 'Enter your twit and hit return'
        read twit
    fi
    echo -n 'wait...'
    curl -u"$user:$pass" -dstatus="$twit" https://twitter.com/statuses/update.xml >/dev/null 2>&1 && echo 'okay'
  }
 
  # print a fortune cookie
  if [ -e /usr/games/fortune ]; then
    if [ -z "$COLORTERM" ]; then
      /usr/games/fortune -a -s
    else
      echo -en "\033[0;36m"
      /usr/games/fortune -a -s
      echo -en "\033[0;37m"
    fi
  fi
fi

Besides a nice prompt and some sane defaults this bashrc defines some handy utils as well:

Convert DOS CRLFs to Unix LFs and vice versa:

$> dos2unix <files>
$> unix2dos <files>

Strip UTF-8 byte order marks

$> bomstrip <files>

Change into a temp directory named after the todays date (create if nessary):

$> td

Change into yesterday's temp dir:

$> td -1