Linux Search Pattern Question: Download Search Pattern PDF

who | cut -d " " -f1.
What is the ouput if the who command displays like this user1 tty 0 1234?
a) user1
b) user1 tty 0 1234
c) tty
d) tty 0 1234

a) user1

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Which character to use to escape meaning of special characters in search operations? a) [] b) ^ c) . d)	Which one is used to select only one copy of the repeated lines? a) uniq -u b) uniq -d c) uniq -c d) uniq -I