Missing Dependency: /usr/share/magic.mime is needed by package httpd-2.2.3-22.el5.centos.i386 (installed)

yum clean ?

This is why I suggest being familiar with Linux before typing commands blindly.

Most every command will disgorge it's sytax when you type the command and then --help

IE:

[root@skyPBXhome configs]# touch --help
Usage: touch [OPTION]... FILE...
Update the access and modification times of each FILE to the current time.

Mandatory arguments to long options are mandatory for short options too.
  -a                     change only the access time
  -c, --no-create        do not create any files
  -d, --date=STRING      parse STRING and use it instead of current time
  -f                     (ignored)
  -m                     change only the modification time
  -r, --reference=FILE   use this file's times instead of current time
  -t STAMP               use [[CC]YY]MMDDhhmm[.ss] instead of current time
  --time=WORD            set time given by WORD: access atime use (same as -a)
                           modify mtime (same as -m)
      --help     display this help and exit
      --version  output version information and exit

Note that the -d and -t options accept different time-date formats.

Report bugs to <bug-coreutils@gnu.org>.
[root@skyPBXhome configs]#

For more in depth help the man pages 'man cmd' will access the online documentation.

If you had looked at the docs instead of tossing your arms up in frustration you would have found this gem:

CLEAN OPTIONS
       The following are the ways which you can invoke yum in clean mode.

       yum clean packages
              Eliminate any cached packages from the system.  Note that pack-
              ages are not automatically deleted after they are downloaded.

       yum clean headers
              Eliminate  all  of  the  files  which yum uses to determine the
              remote availability of packages. Using this option  will  force
              yum to download all the headers the next time it is run.

       yum clean all
              Runs yum clean packages and yum clean headers as above.