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Verifying patches Before applying a patch, it's important to verify that a patch is valid. To do this, we use the sha256sum executable (included in the coreutil package of every RHEL installation): $ sha256sum jbossweb-2.1.10.jar f6d9d32c39c94358fc82ad945478c9c0da4d34e5d912f7afb320e84f87d1c0a2 jbossweb-2.1.10.jar Notice the returned CRC value matches the CRC value listed on the web site.