Expect script under unix throwing error " extra characters after close-quote " while executing [closed]

The Command passed is below which throws error "extra characters after close-quote" while executing

grep '$d' /home/log/Hw.log | awk 'BEGIN { FS = "\\s+|=" } { print \$1,\$2,\$3 \" maxPPS: \" \$14 \" drop%: \" \$23 }'| sort -k 5 -n | tail -1\r

Please assist Thanks