Force filesystem, fsck check on Linux reboot

shutdown -rF now

The -F option forces fsck on reboot

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Show space utiliztion, files and directories, Linux, using sort, top ten

du -ah | sort -hr | head

94G     ./app
94G     .
71G     ./app/oracle
32G     ./app/oracle/crsdata
31G     ./app/oracle/crsdata/@global/cvu/baseline/cvures
31G     ./app/oracle/crsdata/@global/cvu/baseline
31G     ./app/oracle/crsdata/@global/cvu
31G     ./app/oracle/crsdata/@global
24G     ./app/product
21G     ./app/oracle/diag