Linux Search Pattern Question: Download Search Pattern PDF

How do you remove duplicate lines from the file foo using uniq?
a) sort foo | uniq -u
b) sort -u foo | uniq -d
c) sort foo | uniq -c
d) sort foo | uniq -I

a) sort foo | uniq -u

Previous Question	Next Question
One of the entry of /etc/passwd file is shown below: user1:x:1111:2222:google:/home/user1:/bin/bash Which among the following will print userid and home dir in the following pattern "user1:/home/user1"? a) awk `{print $1 ":" $6}` /etc/passwd b) awk `{print $1 ":" $7}` /etc/passwd c) awk `{print $2 ":" $6}` /etc/passwd d) awk `{print $2 ":" $7}` /etc/passwd	What is the command that can print lines of first file matching with second file? a) printline b) cmp c) com d) comm