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benchmark=30;grep "Waiting for timer" wk.txt | awk -vbenchmark=$benchmark '$6 > benchmark' | wc -lis the same asgrep "Waiting for timer" wk.txt | awk -v threshold=30 '$6', which is not returning anything other than a simplegrep "Waiting for timer" wk.txtfor me. Strange.$6is greater than the assigned value ofbenchmark, and your example case has$6 > 30. (Any string starting with alphabets will be greater than "30", (or a any string composed only of digits).)