A .linux application infrastructure
1. Relationship applications and system commands 
2. The directory structure of a typical application 
3. Common package package type 
4.RPM package management tools 
5. General naming format 
6. The package information inquiries rRPM 
-q view installed software package, -qa: View all installed packages
-qi: one package details, check what -ql RPM packages have
-qf: RPM in a certain file, -qc: see where RPM profile
-qd: RPM documentation manuals, -qp: View the package is not installed
7. install, upgrade, uninstall the RPM package 
-i: installation package repository, -u: update
-f: View a file directories belonging to RPM installation package
-c uninstall --force enforce
--nodeps: wean, -h: friendship display
-v: show installation details
8. you are in the yum package source, there will be yum server provides the latest packages, Let's see what path to connect to the server yumf 
II. we yum download a program on the Internet state that this is an Apache Web site
1. our packages are yum source, we first want to install this by yum services 
2. we open the service and to take a look
