Unix
Which of the following special shell variables is used to process number of the current shell?

$$
None of these
$*
$!

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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?

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

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