How do I use the Terminal to run the 10.6.8 update?

After my iMac crashed during the 10.6.8 update install, the Finder won't launch (tried via the Dock and "Force Quit" command). I've used a Terminal window to get to the folder (ChangeDirectory) with a downloaded copy of the 10.6.8 update but I don't know how to launch the Installer program to try to re-install the update (Software Update won't help here because the Mac is updated enough to claim to be running 10.6.8 so it doesn't think there is anything to update).
TIA.

now able to create logical drive but installation again failed, here is the console log:
6/30/11 11:41:30 PM          Installer[966]          Mac OS X Update  Installation Log
6/30/11 11:41:30 PM          Installer[966]          Opened from: /Volumes/Mac OS X 10.6.8 Update/MacOSXUpd10.6.8.pkg
6/30/11 11:41:57 PM          Installer[966]          ========================================================================== ======
6/30/11 11:41:57 PM          Installer[966]          User picked Standard Install
6/30/11 11:41:57 PM          Installer[966]          Choices selected for installation:
6/30/11 11:41:57 PM          Installer[966]                    Install: "Mac OS X Update"
6/30/11 11:41:57 PM          Installer[966]                    Install: "Mac OS X Update"
6/30/11 11:41:57 PM          Installer[966]          ========================================================================== ======
6/30/11 11:41:57 PM          Installer[966]          Configuring volume "HD"
6/30/11 11:41:57 PM          Installer[966]          Free space on "HD": 63.61 GB (63612735488 bytes).
6/30/11 11:41:57 PM          Installer[966]          Create temporary directory "/var/folders/eW/eWl9WrwqGQ0hARMov5qLTk+++TI/-Tmp-//Install.9664INg9O"
6/30/11 11:41:57 PM          Installer[966]          IFPKInstallElement (1 packages)
6/30/11 11:41:57 PM          installd[984]          PackageKit: ----- Begin install -----
6/30/11 11:42:14 PM          kernel          disk0s2: I/O error.
6/30/11 11:42:14 PM          kernel
6/30/11 11:42:14 PM          kernel
6/30/11 11:42:21 PM          kernel          disk0s2: I/O error.
6/30/11 11:42:21 PM          kernel
6/30/11 11:42:21 PM          kernel
6/30/11 11:42:29 PM          kernel          disk0s2: I/O error.
6/30/11 11:42:29 PM          kernel
6/30/11 11:42:29 PM          kernel
6/30/11 11:42:36 PM          kernel          disk0s2: I/O error.
6/30/11 11:42:36 PM          kernel
6/30/11 11:42:36 PM          kernel
6/30/11 11:42:51 PM          kernel          disk0s2: I/O error.
6/30/11 11:42:51 PM          kernel
6/30/11 11:42:51 PM          kernel
6/30/11 11:42:58 PM          kernel          disk0s2: I/O error.
6/30/11 11:42:58 PM          kernel
6/30/11 11:42:58 PM          kernel
6/30/11 11:43:06 PM          kernel          disk0s2: I/O error.
6/30/11 11:43:06 PM          kernel
6/30/11 11:43:06 PM          kernel
6/30/11 11:43:13 PM          kernel          disk0s2: I/O error.
6/30/11 11:43:13 PM          kernel
6/30/11 11:43:13 PM          kernel
6/30/11 11:43:27 PM          kernel          disk0s2: I/O error.
6/30/11 11:43:27 PM          kernel
6/30/11 11:43:27 PM          kernel
6/30/11 11:43:34 PM          kernel          disk0s2: I/O error.
6/30/11 11:43:34 PM          kernel
6/30/11 11:43:34 PM          kernel
6/30/11 11:43:42 PM          kernel          disk0s2: I/O error.
6/30/11 11:43:42 PM          kernel
6/30/11 11:43:42 PM          kernel
6/30/11 11:43:49 PM          kernel          disk0s2: I/O error.
6/30/11 11:43:49 PM          kernel
6/30/11 11:43:49 PM          kernel
6/30/11 11:43:58 PM          kernel          disk0s2: I/O error.
6/30/11 11:43:58 PM          kernel
6/30/11 11:43:58 PM          kernel
6/30/11 11:46:47 PM          installd[984]          Deferred path /usr/bin/mdcheckschema is not in sandbox and will be skipped.
6/30/11 11:47:16 PM          kernel          disk0s2: I/O error.
6/30/11 11:47:16 PM          kernel
6/30/11 11:47:16 PM          kernel
6/30/11 11:47:24 PM          /System/Library/PrivateFrameworks/PackageKit.framework/Resources/shove[100 3]          [source=file] failed _RelinkFile(/var/folders/zz/zzzivhrRnAmviuee+++++++++++/Cleanup At Startup/PKInstallSandbox-tmp/Root/System/Library/Frameworks/SystemConfiguration .framework/Versions/A/_CodeSignature/CodeResources, /System/Library/Frameworks/SystemConfiguration.framework/Versions/A/_CodeSignat ure/CodeResources): Input/output error
6/30/11 11:47:24 PM          kernel          disk0s2: I/O error.
6/30/11 11:47:24 PM          kernel
6/30/11 11:47:24 PM          com.apple.installd[984]          Input/output error
6/30/11 11:47:24 PM          kernel
6/30/11 11:47:24 PM          installd[984]          PackageKit: Install Failed: (null)
Error Domain=PKInstallErrorDomain Code=120 UserInfo=0x1040d2e70 "An unexpected error occurred while moving files to the final destination." Underlying Error=(Error Domain=NSPOSIXErrorDomain Code=5 "The operation couldn’t be completed. Input/output error") {
    NSLocalizedDescription = "An unexpected error occurred while moving files to the final destination.";
    NSUnderlyingError = "Error Domain=NSPOSIXErrorDomain Code=5 \"The operation couldn\U2019t be completed. Input/output error\"";
    arguments =     (
        "-f",
        "-s",
        "/var/folders/zz/zzzivhrRnAmviuee+++++++++++/Cleanup At Startup/PKInstallSandbox-tmp/Root",
6/30/11 11:47:25 PM          Installer[966]          Install failed: The Installer encountered an error that caused the installation to fail. Contact the software manufacturer for assistance.
6/30/11 11:47:27 PM          Installer[966]          IFDInstallController 3EFB090 state = 7
6/30/11 11:47:27 PM          Installer[966]          Displaying 'Install Failed' UI.
6/30/11 11:47:27 PM          Installer[966]          'Install Failed' UI displayed message:'The Installer encountered an error that caused the installation to fail. Contact the software manufacturer for assistance.'.
6/30/11 11:47:27 PM          Installer[966]          The Installer encountered an error that caused the installation to fail. Contact the software manufacturer for assistance.
6/30/11 11:47:29 PM          /System/Library/Frameworks/CoreServices.framework/Frameworks/Metadata.fram ework/Versions/A/Support/mdworker[982]          MDS Error: unable to create user DBs in /var/folders/zz/zzzivhrRnAmviuee++++KE+++3Y/-Caches-//mds
6/30/11 11:47:29 PM          /System/Library/Frameworks/CoreServices.framework/Frameworks/Metadata.fram ework/Versions/A/Support/mdworker[982]          MDS Error: unable to create user DBs in /var/folders/zz/zzzivhrRnAmviuee++++KE+++3Y/-Caches-//mds
6/30/11 11:47:29 PM          /System/Library/Frameworks/CoreServices.framework/Frameworks/Metadata.fram ework/Versions/A/Support/mdworker[982]          MDS Error: unable to create user DBs in /var/folders/zz/zzzivhrRnAmviuee++++KE+++3Y/-Caches-//mds
6/30/11 11:47:29 PM          /System/Library/Frameworks/CoreServices.framework/Frameworks/Metadata.fram ework/Versions/A/Support/mdworker[982]          MDS Error: unable to create user DBs in /var/folders/zz/zzzivhrRnAmviuee++++KE+++3Y/-Caches-//mds
6/30/11 11:47:29 PM          /System/Library/Frameworks/CoreServices.framework/Frameworks/Metadata.fram ework/Versions/A/Support/mdworker[982]          MDS Error: unable to create user DBs in /var/folders/zz/zzzivhrRnAmviuee++++KE+++3Y/-Caches-//mds
6/30/11 11:47:29 PM          /System/Library/Frameworks/CoreServices.framework/Frameworks/Metadata.fram ework/Versions/A/Support/mdworker[982]          MDS Error: unable to create user DBs in /var/folders/zz/zzzivhrRnAmviuee++++KE+++3Y/-Caches-//mds
6/30/11 11:47:29 PM          /System/Library/Frameworks/CoreServices.framework/Frameworks/Metadata.fram ework/Versions/A/Support/mdworker[982]          MDS Error: unable to create user DBs in /var/folders/zz/zzzivhrRnAmviuee++++KE+++3Y/-Caches-//mds

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