$ sed -e '$ a hoge' sources.list.bak deb http://httpredir.debian.org/debian stretch main deb http://httpredir.debian.org/debian stretch-updates main deb http://security.debian.org stretch/updates main hoge $ sed -e '$ i hoge' sources.list.bak deb http://httpredir.debian.org/debian stretch main deb http://httpredir.debian.org/debian stretch-updates main hoge deb http://security.debian.org stretch/u
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