handy bash function to show the directory tree from your current location

tree.sh

# tree
# list the directory structure with the current location as the top level
# based on https://gist.github.com/gpupo/c546128385493c71246d
tree() {
    if [ ! $# -eq 0 ]; then
        case $1 in
            -a)   ls -aR | grep ":$" | sed -e 's/:$//' -e 's/[^-][^\/]*\//--/g' -e 's/^/   /' -e 's/-/|/';;
            -at)  ls -a | grep "/$" | sed -e 's~/$~~' -e 's/^/--/g' -e 's/^/   /' -e 's/-/|/';;
            -t)   ls | grep "/$" | sed -e 's~/$~~' -e 's/^/--/g' -e 's/^/   /' -e 's/-/|/';;
            *)    ls -R | grep ":$" | sed -e 's/:$//' -e 's/[^-][^\/]*\//--/g' -e 's/^/   /' -e 's/-/|/';;
        esac
    else
        ls -R | grep ":$" | sed -e 's/:$//' -e 's/[^-][^\/]*\//--/g' -e 's/^/   /' -e 's/-/|/';
    fi;
}