# unrar x *
UNRAR 5.80 freeware Copyright (c) 1993-2019 Alexander Roshal
Extracting from idd.part1.rar
Extracting from idd.part2.rar
Extracting from idd.part3.rar
Extracting from idd.part4.rar
No files to extract
# du --block-size=1 *
734007296 idd.part1.rar
734007296 idd.part2.rar
734007296 idd.part3.rar
193323008 idd.part4.rar