function rm() {
    # garbage collect
    now=$(date +%s)
    for s in $(ls --indicator-style=none $HOME/.trash/) ;do
        dir_name=${s//_/-}
        dir_time=$(date +%s -d $dir_name)
        # if big than one month then delete
        if [[ 0 -eq dir_time || $(($now - $dir_time)) -gt 2592000 ]] ;then
            echo "Trash " $dir_name " has Gone "
            /bin/rm $s -rf
        fi
    done
 
    # add new folder
    prefix=$(date +%Y_%m_%d)
    hour=$(date +%H_%M_%S)
    mkdir -p $HOME/.trash/$prefix/$hour
    if [[ -z $1 ]] ;then
            echo 'Missing Args'
        return
    fi
    
    #check force? check rmdir?
    force_file="n"
    force_dir="n"
    for arg in $@;
    do
        if [[ "$arg" = "-"* ]] && [[ "$arg" =~ "f" ]];then
            force_file="y"
        fi;
        if [[ "$arg" = "-"* ]] && [[ "$arg" =~ "r" ]];then
            force_dir="y"
        fi;
    done;
    
    for file in $@;
    do
        force="n"
        if [ -e $file ];then
            #check is dir?
            if [ -d $file ];then
                if [ $force_dir = "n" ];then
                    echo "rm: cannot remove "$file"/: Is a directory"
                else
                    echo "Trashing dir : "$file
                    mv $file $HOME/.trash/$prefix/$hour
                fi
            else
                if [ $force_file = "y" ]; then
                    echo "Trashing "$file
                    mv $file $HOME/.trash/$prefix/$hour
                else
                    read -p "rm: remove regular file "$file" ?" force
                    case "$force" in
                        y|Y|Yes|YES|yes|yES|yEs|YeS|yeS)
                            force="y"
                        ;;
                        n|N|No|NO|no|nO)
                            force="n"
                        ;;
                        *)
                    esac
                    
                    if [ $force = "y" ]; then
                        echo "Trashing file : "$file
                        mv $file $HOME/.trash/$prefix/$hour
                    fi
                fi
            fi
        fi
    done;
}