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MS-DOS Commands and Utilities
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Which one of the following is an invalid command?
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A
DIR >> LPT1:
💡 Explanation:
In MS-DOS, redirection to ports like LPT1 uses > for output. The append operator >> works for files but not for printer ports - DIR >> LPT1 is invalid because you cannot append to a port, only overwrite with >. Options A (redirect to file) and B (append to file) are valid commands, so C is the invalid one.