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In the example you provided, cat test1 > test2 < test3, the file test3 is the input stream for cat, but cat is ignoring it because you didn't specify -as an argument. If you instead do cat test1 - > test2 < test3 , then cat will read its stdin, but the final content of test2 will not merely be the content of test3 , but the concatenation of test1 and test3 .
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