Input Redirection   Like redirecting standard output , it is also possible to redirect standard input . Instead of a program reading from your keyboard, it will read from a file. Since input redirection is related to output redirection, it seems natural to make the special character for input redirection be <. It too, is used after the command you wish to run. This is generally useful if you have a data file and a command that expects input from standard input. Most commands also let you specify a file to operate on, so < isn't used as much in day-to-day operations as other techniques.

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