This is a document describing some of the more useful features of the rpm utility in Red Hat.

*** Install a new package ***

	# rpm -i <rpm_name>	or use –ivh for verbose information and hashing 

*** Update a package ***
	
	# rpm -U <rpm_name>	or use –Uvh for verbose information and hashing

*** Remove a package ***

	# rpm -e <package_name>	note that it is the package such as httpd, not the rpm

*** Verify RPM ***

	# rpm --verify -a 			verifies all files on the system
	# rpm --verify -p <rpm_name>	verifies all files within a package
	# rpm --verify --file <filename>	verifies a file

output codes from verification process. if you see these this means that they have changed.
5, MD5 Checksum, S File size, L Symbolic Link, T File modification, D Device, U User, G Group, M Mode

*** Finding the right RPM ***

This is used to find which rpm is associated with the file that you need or are looking for.
	
	# rpm --redhatprovides <filename>

*** RPM Queries ***

To see if a package is installed and to find it’s version number use

	# rpm -q <package_name>

To see which package owns a particular file 

	# rpm -qf <file_name>

To see what files are associated with a package

	# rpm -ql <package_name>

To see all packages installed on the system
	# rpm -qa 				you may want to pipe “|” the info into grep