I am working in my `Tomcat` deployment directory. The files in the directory have the permission: 

 drwxrwsr-x. 10 tomcat www 4.0K Mar 15 15:14 webapps 

A sample sub-directory within `webapps` looks like this: 

 drwxr-sr-x. 6 tomcat www 4.0K Mar 15 15:19 oldApps

While I am a member of group `www`, I am able to create directories in `oldApps`. This is despite the group `www` having no write permissions on `oldApps`. 

I have a line in my `sudoers` file that allows `mkdir` to members of `www` group. I am not able to understand how I can write to the folder `oldApps` without any write permissions on the folder. 

**Update**: 
Ok, I get that I might be running the `mkdir` command as root, thus allowing me to create folders. How do I remove the line from `sudoers` and still be able to create directories?