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Place for playing with commands…
ODOC: bala@bala:~ A pipe is a means by which the output from one process becomes the input to a second. In technical terms, the standard output (stout) of one command is sent to the standard input (stdin) of a second command. If you are not sure of the advantages this creates, then let’s look at a simple example.
Ex: $ echo Hello World! | rev
output: !dlroW olleH