use command du display estimate file space usage size of subdirectories
[oracle@ahjcyl-db backup]$ pwd
/backup
[oracle@ahjcyl-db backup]$ du -sh
15G .
[oracle@ahjcyl-db backup]$ du -h –max-depth=1 /backup/
626M /backup/archivedlog
5.8G /backup/DB_back
3.8G /backup/soft
4.2G /backup/rpm
16K /backup/lost+found
15G /backup/