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Unix

Unix
Which operator will be used with chmod command to assign absolute permission?

-
None of these
%
=
+

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Unix
Which command is used to change protection mode of files starting with the string emp and ending with 1,2, or 3?

chmod 222 emp?
chmod 777 emp*
chmod u+r ??? emp
chmod u+x emp[1-3]

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Unix
Which of the following keys is used to replace a single character with new text?

r
R
s
S

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

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

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Unix
Which of the following is not a communication command.

mail
mesg
grep
write

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Unix
Which of the following commands is not the vi Input mode command?

S
rch
None of these
R
j

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