cat(1) Evidencias%2FBulk_PC-20170427_%2Fjson.txt %7C grep -oE %22%5Cb%28%5B0-9%5D%7B1%2C3%7D%5C.%29%7B3%7D%5B0-9%5D%7B1%2C3%7D%5Cb%22 %7C sort %7C uniq
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.
-E, --show-ends
       display $ at end of each line
source manpages: cat