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

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

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Unix
Which of the following commands is used to remove files with confirmation prompt from the user file system which have neither been accessed nor modified i the last one year?

grep (/usr/*) - mtime + 365 | -ok rm
find /user/* (-mtime + 365 - a - atime +365 ) - OK rm {} ;
find -mtime +365 | rm
find -name - mtime + 365 / - ok rm
None of these

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