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i was working with "cat" comman nd at one instance it jus pressed a cat and mention any name.... and it gave smthin like this whateva i type is diplayed again!! any explanation for this?

Computer Science
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cat ConcATenates the input that it's given and outputs it to stdout. Usually, it's used to combine files. In your example, it's acting like echo. Look at the man page: man cat
oh ok thanks.... :)

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