Unix
The chmod ugo+rw note command can be represented in octal notation as

chmod 555 note
chmod 666 note
chmod 444 note
chmod 333 note

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Unix
The ls -l command tells

None of these
All 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 special shell variable $* is used

to process number of the current shell
to list the positional parameters
None of these
to exit status of ast command executed.
to name the command being executed

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