sed on mac: 'extra characters after p command'

Additionally, if you happen to get this error when using the -i option without an extension:

> sed -i 's/foo/bar/g' file
sed: 1: "file": extra characters at the end of p command

In this case the solution is to explicitly set the extension to an empty string:

> sed -i '' 's/foo/bar/g' file

Add an extra semi-colon after the last p

 sed -n '/\[test\]/{n;p;n;p;}' my-file

(not related to Mac version, also fails on MSYS)

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