LXer: Read and write data from anywhere with redirection in the Linux terminal
 

Published at LXer:

Redirection of input and output is a natural function of any programming or scripting language. Technically, it happens inherently whenever you interact with a computer. Input gets read from stdin (standard input, usually your keyboard or mouse), output goes to stdout (standard output, a text or data stream), and errors get sent to stderr.read more

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Interesting article concerning the inner workings of the OS.