There are cron jobs to maintain certain system logs and db2diag.log , but systems administrators  execute packages for fix packs, monitoring agents for instance status, virus scanners and other utilities , which aren’t always configured or optimized.

The find command will search for files in a directory . In the example below, the parameters I’m using are:

-type  f    (look for regular files)

-ls (print current and statistics)

-sort   (sorts )

And will list the largest 10 files in the path /var

find /var -type f -ls | sort -k 7 -r -n | head -10

 Source:Jack Vamvas