sed replace is not replacing anything

me flag
sed -i 's/#DirectoryIndex index.html/#DirectoryIndex index.php /etc/httpd/conf/httpd.conf'

which gives out the error

sed: -e expression #1, char 57: unknown option to `s'

I am trying to replace index.html with index.php

in flag

You need to close the string before the filename. And you missed the closing /.

sed -i 's/#DirectoryIndex index.html/#DirectoryIndex index.php/' /etc/httpd/conf/httpd.conf
in flag
Note that the replace will not make much difference since the line is commented out.

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