The traditional way of designing command-line programs in Unix-like systems is to chain the output to the input of another program, sometimes several, known as a pipeline, from the | operator.

is the name of a UNIX command, executable program, or shell script to which you want to route output or from which you want to read input. The command(s) must be enclosed in either double or single ...

Enclose the name in quotes. For example, this FILENAME statement associates YR1999 with a file stored on a tape that is mounted on device /dev/tp0: UNIX-commands are the commands needed to process the ...