Objective 2: Process Text Streams Using Filters
Many of the commands on Linux systems are intended to be used as filters, meaning that multiple commands can be piped together to perform complex operations on text. Text fed into the command’s standard input or read from files is modified in some useful way and sent to standard output or to a new file, leaving the original source file unmodified. Multiple commands can be combined to produce text streams, which modify text at each step. This section describes basic use and syntax for the filtering commands important for Exam 101. Refer to a Linux command reference for full details on each command and the many other available commands.