Bash/Shell-Commands

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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.

• 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.