How to list the content of a folder and get total size summary of the parent folder at the end

To list the size of all folders and get a summery at the end, use the --max-depth=1 switch with the du command.

In the listing below, I am following the examples of a recent blog post by Mike Dietrich, to measure the size of the subfolders in the .patch_storage folder, which is maintained by OPatch in case the DBA needs to rollback the patches later.

cd $ORACLE_HOME/.patch_storage

du -h --max-depth=1
100K    ./29585399_Apr_9_2019_19_12_47
284K    ./NApply
4.0K    ./oracle-home-1681903491076105
434M    ./34786990_Dec_6_2022_13_24_50
20K     ./NRollback
436M    ./35050341_Mar_17_2023_04_11_10
2.0G    ./35042068_Apr_6_2023_15_25_04
91M     ./backup_delete_inactive
2.9G    .