cat(1) -n %2Fhome%2Fmarcos%2FEvidencias%2FBulk_PC-20170427_%2Femail.txt %7C grep -E -o %22%5Cb%5Ba-zA-Z0-9.-%5D%2B%40%5Ba-zA-Z0-9.-%5D%2B%5C.%5Ba-zA-Z0-9.-%5D%2B%5Cb%22 %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.
-E, --show-ends
       display $ at end of each line
source manpages: cat