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IDE: Programmer Development Integration Environment

DLL: Dynamic Link Library, note that this is a library, public library, shared library, shared library can be. Dynamic link library.

*.SO So refers to an extension, such files represent shared objects, shared Object = DSO

Login:

User name: The user name we say is actually not recognized by the system. There is an established correspondence between the user name and the user ID. When we input the user name, the system will find the corresponding user ID through this to perform authorization authentication.

Authentication mechanism

Audition

Authorization

Promt Command Prompt

The official explanation for magic number is that the first few bytes of many types of files are fixed (either intentionally padded or inherently so). Based on the contents of these bytes, the file type can be determined, so the contents of these bytes are called magic numbers. And we do operations, generally call this program or command execution entry or format, for example, the first line of code in a shell script.

#!/ bin/bash --This is the program execution entrance, this is the magic number.

Parameter parameter, the parameter of an instruction or command is to specify the operation object, and the option, as mentioned earlier, specifies the way the command is executed, or modifies the way the command is executed.

Directories. In linux, directories are path maps and files. What is the route strength: the route is written in a certain format from the specified starting point position to the destination, that is, the route.

file system: a mechanism called hierarchical file management

The working directory, that is, the directory where the person is located, is the working directory. The last item in parentheses in the linux command prompt is the current working directory.

FHS File System Hierarchy Standard

PWD print work directory Output working directory, that is, output current directory.

The blue ones in Linux are directory files.

Green is executable files, of course, there are many kinds of colors, about six kinds, have not yet learned, learned later to put.

Linux has two famous philosophies:

1) Everything is a document.

2. No message is the best message (the command is executed successfully without error, and the unsuccessful execution will prompt a lot of information if there is an error)

Linux uses Linux system to use root privileges as little as possible, usually use general accounts for management, and only switch to root user for management when it is necessary to use root user.

Write here for the time being, and then supplement the explanation later.

The next article talks about common commands, such as ls, cd, man, type, etc.

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