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!was connected tod, not123.{d;q;}, shouldn'tqapply to every line (so only the first)?qapplies to every line where it's executed. But when the line number is not 123, thedcommand is executed, and its meaning is to skip immediately to the next input line.sed -n 123p(prints the same output) except it stops after line 123 rather than processing potentially thousands more lines that it will never do anything with anyways.