2 mkdir
-p about code writing
3 sed
'/id=\"menu\"/s/middle/top/; /<body/s/yellow/green/; /id=\"about\"/s/class=\".*\"/class=\"selected\"/; /data-name=\"about\"/s/class=\"\"/class=\"selected\"/' < index.html
> about
/index.html
4 sed
'/id=\"menu\"/s/middle/top/; /<body/s/yellow/blue/; /id=\"code\"/s/class=\".*\"/class=\"selected\"/; /data-name=\"code\"/s/class=\"\"/class=\"selected\"/' < index.html
> code
/index.html
5 sed
'/id=\"menu\"/s/middle/top/; /<body/s/yellow/pink/; /id=\"writing\"/s/class=\".*\"/class=\"selected\"/; /data-name=\"writing\"/s/class=\"\"/class=\"selected\"/' < index.html
> writing
/index.html