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Added insert/add line examples
Added insert/add line examples.
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@ -15,3 +15,9 @@ sed '/^$/d' file.txt
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# To replace newlines in multiple lines
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sed ':a;N;$!ba;s/\n//g' file.txt
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# Insert a line before a matching pattern:
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sed '/Once upon a time/i\Chapter 1'
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# Add a line after a matching pattern:
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sed '/happily ever after/a\The end.'
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