RPM (Red Hat Package Manager), essentially in order to reduce the difficulty of installing the software, the source code for the installation rules are packaged together, let the system automatically identifies installation source code.
Although RPM has been able to simplify software installation difficulty, but there are more complex dependencies large software installation, Yum depot to a large number of commonly used software packaged together, to further reduce software installation difficulty, by resolving package dependencies, automatic cloud install the software.
Shell (also referred to as terminal or shell) acts as a translator between the people and the core (hardware), users put some command "tell" the terminal, it will call the appropriate program service to complete some of the work. Now many mainstream Linux system, including terminal systems, including Red Hat default is Bash (Bourne-Again SHell) interpreter. Bash mainstream Linux system selection as a command line interpreter terminal are the following four advantages:
1: the vertical direction by the transfer of a Linux command executed previous key;
2：命令或参数仅需输入前几位就可以用Tab键补全；
3：具有强大的批处理脚本；
4：具有实用的环境变量功能。Linux Format command: Command name + command + command object parameter
command object generally refers to the file processing, directory, users and other resources, including parameters, the object can be omitted.