Problem with bash in fedora 18

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http://www.linuxquestions.org – I switched from Ubuntu to fedora two months ago.Everything was fine until in last two or three days I'm start facing a series of problems . 1.whenever I tries to switch from normal user through Code: su -l - or Code: su -l- i"m getting Code: -bash-4.2# instead of Code: [root@cooper ~]#. 2.whenever I tries to switch in superuser mode through Code: sudo -i the terminal directly gives me Code: -bash-4.2#, without asking a password. 3.The root user is unable to change the permission on any file even created by the normal users.It shows permission denied whenever I tri (HowTos)