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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Monitoring response time with curl

   curl -s -o /dev/null -w "Conecction: %{time_connect}s | Start transfer: %{time_starttransfer}s | Total time: %{time_total}s\n" ...

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