To find out how to install a certain command or utility via yum you can use list or the “whatprovides” option as shown below.  

This is an example of using yum with the list option to find any packages with “send” in the name.

yum list *SEND*

Using this command will provide results like the below.

[root@server ~]# yum list *SEND*
Loading "installonlyn" plugin
Setting up repositories
Reading repository metadata in from local files
Available Packages
mgetty-sendfax.x86_64 1.1.33-9.fc6 base
nautilus-sendto.x86_64 0.7-5.fc6 base
nautilus-sendto-bluetooth.x86_64 0.7-5.fc6 base
perl-Email-Send.noarch 2.192-2.el5.rf rpmforge
perl-Jabber-SimpleSend.noarch 0.03-1.el5.rf rpmforge
perl-Mail-SendVarious.noarch 0.3-1.el5.rf rpmforge
perl-Mail-Sender.noarch 0.8.16-1.el5.rf rpmforge
perl-Mail-Sendmail.noarch 0.79-1.2.el5.rf rpmforge
perl-Net-SenderBase.noarch 1.01-1.el5.rf rpmforge
perl-X11-SendEvent.noarch 1.3-1.2.el5.rf rpmforge
sendip.x86_64 2.5-2.el5.rf rpmforge
sendmail.x86_64 8.13.8-2.el5 base
sendmail-cf.x86_64 8.13.8-2.el5 base
sendmail-devel.x86_64 8.13.8-2.el5 base
sendmail-devel.i386 8.13.8-2.el5 base
sendmail-doc.x86_64 8.13.8-2.el5 base

If you are unable to provide the command or utility you are looking for using the list option then try whatprovides as shown below when trying to install iostat.

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