Linux Search Pattern Question: Download Search Pattern PDF

Which character to use to escape meaning of special characters in search operations?
a) []
b) ^
c) .
d)

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What is the command that can print lines of first file matching with second file? a) printline b) cmp c) com d) comm	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