Unix
If a file has read and write permissions for the owner, then the octal representation of the permissions will be

3
1
6
None of these
5

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Unix
The ls -l command tells

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

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Unix
The cp command uses:

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

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