|cat -- concatenate and print
|cat file1 ...
|cat reads each file in sequence and writes it on thestandard output stream. Thus:
|cat file is about the easiest way to print a file. Also:
|cat filel file2 >file3 is about the easiest way to concatenate files.
|If no input file is given cat reads from the standard inputfile.
|none; if a file cannot be found it is ignored.