eg:

Create a text file called ip.txt
[root@www ~]# touch ip.txt

Put all the ip into the file and save it
[root@www ~]# vi ip.txt

192.168.1.22
192.167.1.22
192.168.1.23
192.168.1.23
192.168.1.70
192.168.1.88
192.168.1.89
192.168.1.40
192.168.1.63
192.168.1.77
192.168.1.79
192.168.1.78
192.168.1.11
192.168.1.82
192.168.1.24
192.168.1.91
192.168.1.64
192.168.1.94
192.168.1.21
192.168.1.96
192.168.1.95
192.168.1.69
“ip.txt” 138 lines, 2138 characters

Execute below command to find the duplicate ip
[root@www ~]# sort ip.txt | uniq -d

#It will display all the duplicate IP
192.168.1.22

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