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Bash Reference Manual

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.

3.2.1 Simple Commands		The most common type of command.
3.2.2 Pipelines		Connecting the input and output of several commands.
3.2.3 Lists of Commands		How to execute commands sequentially.
3.2.4 Looping Constructs		Shell commands for iterative action.
3.2.5 Conditional Constructs		Shell commands for conditional execution.
3.2.6 Grouping Commands		Ways to group commands.