Bash copy tool giving speed and progress bar, working for files and directories built of pv

pcp.sh

#!/bin/bash

hash pv

if [ $? -ne 0 ]; then
        echo "ERROR: Command pv is not available but required, please run: sudo apt-get install pv"
        exit 1
fi

WORKDIR=$(pwd)

FROM=$1
TO=$2

TOPATH=$(dirname $(realpath "$TO"))
FILENAME=$(basename "$FROM")


if [[ ! -d "$FROM" ]] && [[ ! -f "$FROM" ]]; then
        echo "ERROR: Input: $FROM is neither a file or directory, nothing to do"
        exit 1
fi

if [[ ! -d "$TOPATH" ]]; then
        if [[ -f "$TO" ]]; then
                echo "ERROR: Destination: $TO is already a file"
        else
                echo "ERROR: Destination: $TO does not exist!"
        fi
        exit 1
fi


START=$(($(date +%s%N)/1000000))

BYTES=$(du -bs "$FROM" | awk '{print $1}')

END=$(($(date +%s%N)/1000000))

echo "Gathering size took $(($END-$START)) milliseconds"

if [[ -d "$FROM" ]] && [[ -d "$TO" ]]; then
        CHILD=$(dirname "$FROM")
        DIR=$(basename "$FROM")
        cd "$CHILD"
        tar -cf - "$DIR" | pv -s $BYTES | tar -C "$TO" -x
        exit $?
fi

if [[ -f "$FROM" ]] && [[ -d "$TO" ]]; then
        pv -s $BYTES "$FROM" > "$TOPATH/$FILENAME"
        exit $?
elif [[ -f "$FROM" ]] && [[ ! -d "$TO" ]] && [[ ! -f "$TO" ]] && [[ -d "$TOPATH" ]]; then
        pv -s $BYTES "$FROM" > "$TO"
        exit $?
fi