note
davidrw
While i love <c>uniq</c>, it's not a solution here. OP said "I want to remove duplicate entries for one single instance of COMPUTER column." Not eliminate duplicate lines, which your <c>uniq</c> examples doe.<br>
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My first action after reading OP was to man uniq -- there's options to "avoid comparing the first N fields" and "avoid comparing the first N characters", but unfortunately neither of those work for comparing just the first column (of a tab-delim'd file).
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