Check the dir size

To check the Dir size.
=====================

[root@TESTBED ~]# du -h --max-depth=1 /opt/ | sort -n -r

[root@TESTBED ]# du -h --max-depth=1 | sort -n -r


File size
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[root@TESTBED ]# du -h -s /opt/abc.txt

[root@TESTBED ]# du -h -s /opt/*