Famous Pipes and nameless pipes

Pipeline:

1. Pipelines are the oldest form of inter-process communication between UNIX systems, essentially a virtual file that maintains a message queue in the kernel.

2. Historically, pipelines usually refer to half-duplex pipes, allowing only one-way flow of data. Most modern systems offer full duplex piping, and data flows in two directions along the pipeline.

Known pipeline (FIFO):

1. Concept: Pipeline communication based on a well-known file (pipe file)

2. Order Form:

# Mkfifo FIFO Create pipeline

# echo Hello > FIFO read in Hello to pipeline

# Cat FIFO view content in pipeline

Demonstrate:

Attention:

1. Execute the echo command the first terminal is blocked on write, only after using the second terminal cat, unblocked

2. The pipeline itself is not a memory, you can use the Ls-l command to view: The first P indicates piple

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Famous Pipes and nameless pipes