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Did you try the sort command directly on your input file instead of implementing it in your while loop?


$ cat file
192.168.1.1
192.168.2.2
192.168.1.3
192.168.1.2
192.168.11.1
192.168.1.4...

What is your input data and which OS are you running? What you posted doesn't correspond with the input you posted earlier. The sort command doesn't change the data, only the order in which it's...

Try this:
sort -t . -k 3,3n -k 4,4n file