cat(1) Evidencias%2FBulk_PC-20170427_%2Fjson.txt %7C egrep -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
concatenate files and print on the standard output
Concatenate FILE(s), or standard input, to standard output.

With no FILE, or when FILE is -, read standard input.
source manpages: cat