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for insert two line in first, you use \n. But we see in "General Purpose Utilities" in Linux video that for \n we have to use -e. But here you don't use -e, why?
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Outline:یعنی متبادل substitute یعنی داخل کرنا insert یعنی حزف کرنا delete
یعنی متبادل substitute یعنی داخل کرنا insert یعنی حزف کرنا delete
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