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Unix

Unix
Which of the following files will displayed by this command cat *ch*

patch
.ch
catch
All of these

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

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

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Unix
Which shell's wild-cards is used to match a single character?

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

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Unix
Which command is used to assign only read permission to all three categories of the file 'note'?

chmod ugo=r note
chmod u+r,g+r,o-x note
chmod go+r note
None of these
chmod a-rw

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Unix
Which command is used to display a file contents in octal form?

od
cd
oct
of

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