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sed -n '1,3p' temp.txt // print line1 to line3
extract log
Extract the lines which include the string from "2012-02-09" to "2012-09-10" sed -n '/^2012-02-09/,/^2012-09-10/p' whole.log > part.log reference
add string to line tail
sed 's/$/tail/' test1.txt reference