Unix
Which commands is used to assign executable permission to all of the files named "letter"?

chmod ugo+x letter
chmod u+x letter
chmod ugo+r letter
chmod ugo+rw letter

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Unix
The ls -l command tells

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

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