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 *.*
rm -r *
rm *
rm all

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Unix
The % key allows you

to move the cursor backward to the beginning of a word
to move the cursor to the upperleft corner of the screen
to move the cursor to the first column in the current line
to move the cursor to a matching delimiter, when a delimiters a parenthesis, a bracket, or a brace.

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Unix
The cp command uses:

standard output file
neither standard input nor standard output file
both input and output file
standard input file

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