can be pointed at specific files using:
du -ahc /path/to/file
counting only directories is faster:
du -hc .
Other solutions that involve doing
du -sx /*
are incomplete because they will still descend other top-level filesystems are that mounted directly at "/" because the * expands to explicitly include all files and directories in "/", and du will still traverse them even with -x because you asked it to by supplying the directory name as a parameter (indirectly via "*").
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