In this chapter we learned how commands can be linked to each other, and how input from one command can be used as output for another command.
Input/output redirection is a common task on UNIX and Linux machines. This powerful mechanism allows flexible use of the building blocks UNIX is made of.
The most commonly used redirections are > and |. Refer to Appendix C, Shell Features for an overview of redirection commands and other shell constructs.
Table 5.1. New commands in chapter 5: I/O redirection
| Command | Meaning |
|---|---|
| date | Display time and date information. |
| set | Configure shell options. |
| sort | Sort lines of text. |
| uniq | Remove duplicate lines from a sorted file. |