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Shell commands are executed in parallel in pipelines. Each command in a pipeline is executed as a separate process (i.e., in its own subshell).
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Proof
sleep 3 | echo "Hello world."
Shell - Parallel
Shell commands are executed in parallel in pipelines. Each command in a pipeline is executed as a separate process (i.e., in its own subshell).
sleep 3 | echo "Hello world."