Getting Started with Linux 1

In computer science, the shell is commonly known as a shell (used to differentiate itself from the kernel) and refers to the "user Interface" software (command parser). It is similar to DOS command and later cmd.exe. It receives the user command and then invokes the appropriate application.

Linux:
Kernel: Managing and assigning running resources
Library: No execution portal, can only be called: So shared object DLL Dynamic link library
Application: A program entry interface, desktop is an application

Basic principles of Linux:
1. Consisting of small programs with a single purpose; Combine small programs to complete complex tasks
2. All Documents
3. Avoid capturing user interfaces as much as possible
4. Save the configuration file in plain text format

User interface: GUI interface, CLI interface
#root $ normal User
Shell is an application of the user interface
#ps aux | grep bash
Bash can open a bash again.
#bash The second bash was opened in the first one.
#ls was opened in the second one.
#exit打开几个写几遍exit
One-in comes from moving up a bash that provides the user with a program entry
#more/etc/passwd
Command format: Command
Options (short option-long option--)
Parameters

Getting Started with Linux 1