Shell Commands (Bash Reference Manual)

From Get docs

3.2 Shell Commands

A simple shell command such as echo a b c consists of the command itself followed by arguments, separated by spaces.

More complex shell commands are composed of simple commands arranged together in a variety of ways: in a pipeline in which the output of one command becomes the input of a second, in a loop or conditional construct, or in some other grouping.

Reserved Words    Words that have special meaning to the shell.
Simple Commands    The most common type of command.
Pipelines    Connecting the input and output of several commands.
Lists    How to execute commands sequentially.
Compound Commands    Shell commands for control flow.
Coprocesses    Two-way communication between commands.
GNU Parallel    Running commands in parallel.