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Bash Reference Manual

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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.

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