You can also redirect a process's input source. Instead of letting it assume that it should get its input from the normal console keyboard, you can tell it to get its input from another terminal, a file or an input port:
You can also pipe the output of a process directly to another without storing the data in an intermediate file. The most common uses of the pipe are as follows:
| Unix Command | Meaning |
| ls | more | feed directory listing one screen-full at a time |
| ls | lp | send directory listing to printer instead of screen |
You can also pipe the output of an initial process through more than one intermediate process before outputting the result. Intermediate processes are referred to as filters. An example of a filter is the sort process:
