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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Create pem certificate

 Creating a .pem with the Private Key and Entire Trust Chain     Log into your DigiCert Management Console and download your Intermediate (D...

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