Basic Computer related concepts

1. von Neumann architecture:

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2.Linux System Features: Open, multi-user, multi-tasking, good user interface (the traditional Linux interface is a text-based command-line interface, that is, the shell, has a strong program design capabilities, users can easily use it to compile programs, thereby providing users with more advanced means to expand the system functions.

Linux Features: Open source free and stable, with device independence, rich network functions, reliable network security, good portability.

3.Linux is divided into the kernel and shell, the kernel is the core of the operating system, functions: virtual memory, multitasking, shared library, demand loading, executable programs and TCP/IP network functions.

Shell: a command-line interpreter that identifies and analyzes commands. Shell Development Shell (interface Program) and Windows window functions the same. Bash interpreter is a kind of shell

Shell Shell Features:

1. Read and Identify commands

2. Adjust the interface provided by the operating system

3. Interface return command

The Linux commands are divided into:

A.shell internal commands, which load memory when the shell is started, like the commands that the operating system itself has, such as: Cd,mkdir,rm.

B.shell external commands, most commands in Linux belong to shell external commands, each shell external command has a separate executable program (utility program)

4. in Linux, files: devices, displays, all document design ideas (software layer implementation of virtual)

5. item Type:
ordinary documents (regular File

record (directory) : The first character is [d]
3.< Span style= "Color:rgb (0,0,0); font-family: ' Stheitisc-light '; font-size:14pt;" > Connector (Link) the first character is [l]
4. device and device files
block device files, that is, some storage files, such as hard disks, floppy disks, etc., the first character is
[b Character device file, which is the interface file of some serial end, such as keyboard, mouse, etc.,
the first character is [C]

5. socket (sockets) The first character is [s]

6. Pipe (FIFO, Pipe) The first character is [P ]

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Basic computer-related concepts