A decent and portable 'which' command for bash

which.sh

function which { 
    local CMD=$1;
    if alias $1 &>/dev/null; then
        CMD=$(alias $1 | sed "s/^alias $1='\([^' ]*\).*$/\1/");
        if [[ "$CMD" != $1 ]]; then
            type $1;
            which "$CMD";  # recursive call for nested aliases
            return;
        fi;
    fi;
    local FILE=$(type -P "$CMD");
    # Add an * after the file that would be executed
    type -a "$CMD" | sed '\|^'"$CMD"' is '"$FILE"'$|s|$| *|';
    # If symlink, show the (likely) real file
    [[ ! -L "$FILE" ]] && return;
    local TARGET=$(command ls -l "$FILE");
    echo "* symbolic link: $FILE -> ${TARGET#* -> }"
}