cat(1) -n ForemostDump_Mon_Jul_24_11_49_15_2017%2Faudit.txt %7C head -n 20
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