(bash.info) 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.
Menu
* 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.
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