Unix
Which command is used to delete all files in the current directory as well as all files and sub-directories in its subdirectories?

None of these
rm -r *
rm all
rm *
rm *.*

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Unix
The ls -l command tells

who the owner of the file is
how large the file is and when the file was last modified.
the name of the group owner of the file
None of these
All of these

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