Unix
The command which transcribes the standard input to the standard output and also makes a copy of the same in a file is

tr
sort
tee
grep

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Unix
The % key allows you

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

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Unix
The cp command uses:

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

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