I don't know about command prompt on Windows OS but in Linux, you use the concept of redirection using '>' and '<' symbols. For eg: 'ls>file' would create a file called 'file' and write the output of the 'ls' command in it, i.e., you redirect output of 'ls' to 'file' instead of Standard Output. Similarly, some commands require some input from the keyboard (stdin). You can change it as: 'command<file' so that the command reads from 'file' instead.
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