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Question
In linux, what does the below code do? 
sed -e '7a\
an extra line' test.txt
Answer
It adds the line "an extra line" after line 7 of test.txt, but note that this output is only sent to stdout, the file itself is not changed!!!

Question
In linux, what does the below code do? 
sed -e '7a\
an extra line' test.txt
Answer
?

Question
In linux, what does the below code do? 
sed -e '7a\
an extra line' test.txt
Answer
It adds the line "an extra line" after line 7 of test.txt, but note that this output is only sent to stdout, the file itself is not changed!!!
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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, which can also be regular expressions match

Summary

statusnot learnedmeasured difficulty37% [default]last interval [days]               
repetition number in this series0memorised on               scheduled repetition               
scheduled repetition interval               last repetition or drill

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