Copy missing files from source to destination dir on Linux

copy_diff.sh

#!/bin/bash

# THIS ONLY CHECK THE DIFF IN AMOUNT OF FILES, NOT ACTUAL CONTENT!!!
# Make sure the SRC path has more files than the DST.

SRC_PATH="/d/Games/SteamLibrary/steamapps/common/assettocorsa/content/cars"
DST_PATH="//192.168.1.5/home/Backupy/AC Content Manager/content/cars"

DIFF_RESULT=$(diff --brief "$DST_PATH" "$SRC_PATH" \
              | sed --quiet "s~^Only in \($SRC_PATH\): \(.*\)~'\1\/\2'~p")

if [ -n "$DIFF_RESULT" ]; then
	echo -e "\n"

	echo "$DIFF_RESULT" \
 		  | xargs cp --recursive --verbose --target-directory="$DST_PATH"	

	echo -e "\n---\n\n@ DONE";
	exit 0;
else
	echo -e "\n@ ERR: Nothing to copy!!!";
	exit 1;
fi