Which package does a file belong to? – Use yum provides

Use ‘yum provides’ if you like to know which package a particular file belongs to. For example, if you like to know the name of the package that has the /etc/sysconfig/nfs file, do the following.
# yum provides /etc/sysconfig/nfs
Loaded plugins: langpacks, presto, refresh-packagekit
1:nfs-utils-1.2.3-10.fc15.x86_64 : NFS utilities and supporting clients and
                                 : daemons for the kernel NFS server
Repo        : fedora
Matched from:
Filename    : /etc/sysconfig/nfs

1:nfs-utils-1.2.4-1.fc15.x86_64 : NFS utilities and supporting clients and
                                : daemons for the kernel NFS server
Repo        : updates
Matched from:
Filename    : /etc/sysconfig/nfs

1:nfs-utils-1.2.4-1.fc15.x86_64 : NFS utilities and supporting clients and
                                : daemons for the kernel NFS server
Repo        : installed
Matched from:
Other       : Provides-match: /etc/sysconfig/nfs