Shell Commands (Bash Reference Manual)
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Bash/docs/latest/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.
| • Reserved Words | Words that have special meaning to the shell. | |
| • 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. |
