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8. Streams and sed -- The Stream Editor perations that make it easy to write scripts that edit configuration files for you. For instance, sed -e '7a\ an extra line.\ another one.\ one more.' a ppends three lines after line 7, whereas <span>sed -e '7i\ an extra line.\ another one.\ one more.' i nserts three lines before line 7. Then sed -e '3,5D' D eletes lines 3 through 5. In sed terminology, the numbers here are called addresses, w
last interval [days]
repetition number in this series
scheduled repetition interval
last repetition or drill
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