cd_func

# From http://aijazansari.com/2010/02/20/navigating-the-directory-stack-in-bash/index.html
# An enhanced 'cd' - push directories
# onto a stack as you navigate to it.
#
# The current directory is at the top
# of the stack.
#
function stack_cd {
    if [ $1 ]; then
        # use the pushd bash command to push the directory
        # to the top of the stack, and enter that directory
        pushd "$1" > /dev/null
    else
        # the normal cd behavior is to enter $HOME if no
        # arguments are specified
        pushd $HOME > /dev/null
    fi
}
# the cd command is now an alias to the stack_cd function
#
alias cd=stack_cd
# Swap the top two directories on the stack
#
function swap {
    pushd > /dev/null
}
# s is an alias to the swap function
alias s=swap
# Pop the top (current) directory off the stack
# and move to the next directory
#
function pop_stack {
    popd > /dev/null
}
alias p=pop_stack
# Display the stack of directories and prompt
# the user for an entry.
#
# If the user enters 'p', pop the stack.
# If the user enters a number, move that
# directory to the top of the stack
# If the user enters 'q', don't do anything.
#
function display_stack
{
    dirs -v
    echo -n "#: "
    read dir
    if [[ $dir = 'p' ]]; then
        pushd > /dev/null
    elif [[ $dir != 'q' ]]; then
        d=$(dirs -l +$dir);
        popd +$dir > /dev/null
        pushd "$d" > /dev/null
    fi
}
alias d=display_stack