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(bashref.info)Shell Commands

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Shell Commands
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   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.

Simple Commands

The most common type of command.

Pipelines

Connecting the input and output of several

commands.

Lists

How to execute commands sequentially.

Looping Constructs

Shell commands for iterative action.

Conditional Constructs

Shell commands for conditional execution.

Command Grouping

Ways to group commands.