If you have set up a user account as a member of the wheel group then you should be able to do whatever you want to do by using the sudo utility. Since different Linux distributions have different details in this area you should read the /etc/sudoers file to see if the wheel group is listed as authorized to use sudo. It should be but you never know what a distro developer is going to do.
1) That directory is publicly viewable. Your user account should already be able to see into that directory.
2) This is a matter of setting group membership for the user account and proper file permissions on the files.
2a) Find out what group owns the /usr/share/apache-tomcat-6.0.20/logs directory and the files within it.
2b) Then make sure that the group has rwx permission on the directory and rw permission on the files.
2c) Add your user account to the group that owns those files.
You may need to set the umask of the account that runs the tomcat software. I don't use tomcat so I don't know the details of how it is run, and you didn't tell us your distribution so there is no way that I could be sure how tomcat is run on your distribution.
Last edited by stress_junkie; 07-08-2009 at 08:05 AM.