echo"" LogFormat ""%h %l %u %t \\""%r\\"" %>s %b \\""%{Referer}i\\"" \\""%{User-Agent}i\\"""""" combined"" >> /end/of/some/file.conf prints this to file: LogFormat %h %l %u %t \%r\ % %b \%{Referer}i\ \%{User-Agent}i\ combined is supposed to look like this: LogFormat "%h %l %u %t \"%r\" %>s %b \"%{Referer}i\" \"%{User-Agent}i\"" combined