You have a hierarchy of directories and some files in some of those directories: /root/devops/dir1/file1.txt, file2.txt, ... /root/devops/dir2/file3.txt, file4, ... /root/devops/file6.in, file7.out, ... ... Some of these files contain IP addresses inside the text. An IP address is a string of form x.x.x.x where each x is a number from 0 to 255 (inclusive). For example, say we have file1.txt that looks like this: hello world 127.0.0.1 this is some example 128.99.107.55 file with some correct and incorrect 128.128.4.11 ip 0.11.1115.78 addresses This file contains only 3 IP addresses, namely 127.0.0.1, 128.99.107.55, and 128.128.4.11, since 0.11.1115.78 is not a valid IP address. Your task is to find all distinct IP addresses from all the files in the /root/devops/ directory and print them in lexicographical order. Example For the following /root/devops/ directory: /root/devops/dir1/file1.txt hello world 127.0.0.1 this is some example 128.99.107.55 file with some correct and incorrect 128.128.4.11 ip 0.11.1115.78 addressesaddresses /root/devops/dir1/file2.txt hello from 74.0.65.76 and 8.dd.99.88.907 good this is some example 306.5.76.35 file with some correct and incorrect 15.128.4.65 ip addresses 0.0.0.0 /root/devops/dir2/file3.txt 127.65.64.1 127.0.64.1 127.0.0.1 exaMple 128.57.107.76 128.57.907.70 file with some correct and incorrect 67.128.4.11 ip addresses 7.7.7.8 /root/devops/dir2/file4.txt hello world 127.98.0.1 this is some example 128.96.107.55 file with some correct and incorrect 128.68.4.11 ip addresses /root/devops/f.inp hello world 127.0.49.1 this is some example 128.99.58.55 8.88.888.88 77.255.255.254 7.7.257.25 file with some correct and incorrect 26.56.4.23 ip addresses the output should be 0.0.0.0 127.0.0.1 127.0.49.1 127.0.64.1 127.65.64.1 127.98.0.1 128.128.4.11 128.57.107.76 128.68.4.11 128.96.107.55 128.99.107.55 128.99.58.55 15.128.4.65 26.56.4.23 67.128.4.11 7.7.7.8 74.0.65.76 77.255.255.254 [execution time limit]
