explainshell.com - cat -n %2Fhome%2Fmarcos%2FEvidencias%2FBulk_PC-20170427_%2Fether.txt %7C grep -io %27%5B0-9A-F%5D%5C%7B2%5C%7D%5C%28%3A%5B0-9A-F%5D%5C%7B2%5C%7D%5C%29%5C%7B5%5C%7D%27 %7C sort %7C uniq

-n %2Fhome%2Fmarcos%2FEvidencias%2FBulk_PC-20170427_%2Fether.txt %7C grep -io %27%5B0-9A-F%5D%5C%7B2%5C%7D%5C%28%3A%5B0-9A-F%5D%5C%7B2%5C%7D%5C%29%5C%7B5%5C%7D%27 %7C sort %7C uniq

concatenate files and print on the standard output

-n, --number
       number all output lines

Concatenate FILE(s), or standard input, to standard output.

With no FILE, or when FILE is -, read standard input.

source manpages: cat