Comment line with sed

comment line starting with abc
sed -i '/^abc.*/s/^/#/' file

comment all lines in the file
sed -i '/^/s/^/#/' file

comment line starting with abc and append a comment on end of line
sed '/^abc.*/s/^/# /; //s/$/ comment/' file
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Vimrc example

 syntax on                   " modo visual/colorido ativo set showmode                " apresenta o modo de utilizacao atual (comm...

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