Unix
Which of the following shell's wildcards are used to match any number of characters including none?

None of these
[ijk]
*
?
[!ijk]

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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 -mtime +365 | rm
find -name - mtime + 365 / - ok rm
find /user/* (-mtime + 365 - a - atime +365 ) - OK rm {} ;
grep (/usr/*) - mtime + 365 | -ok rm

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Unix
The cp command uses:

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

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