Linux file system

The philosophical thought of Linux includes the following aspects:

1, everything is composed of files (including hardware devices, as well as communication interfaces, etc.), using text files to save configuration information (benefit: A text editor to complete most system operations).

2, by a number of functions of a single program: To ensure that a program only do one thing, and can do it well.

3, try to avoid interaction with the user. (Easy to automate tasks in a programmatic way)

Ii. documentation System and Documentation:

Linux uses a file system in the form of a directory, file, and tree hierarchy. The main directory is to do path mapping; A file is a stream of data stored in a storage space, and the data can be accessed by name.

1, the file path representation:

Absolute path: The path from the root start.

Relative path: The path represented at the beginning of the current position.

2, the use of the file name rule:

Strictly distinguish character case;

The directory is also a file, under the same path, two files cannot have the same name;

Supports any character other than/;

The maximum length cannot exceed 255 characters.

3. Linux File system structure:

/: System original starting point, root directory.

Home: User home directory (user start directory), the location of normal user management files.

Working directory:

/etc/sysconfig/network-scripts/ifcfg-eno16777736

BaseName: The right-most file or directory name, such as the above ifcfg-eno16777736;

Dirname:basename the path to the left, as above/etc/sysconfig/network-scripts/;

Get basename of File path:

#basename/etc/sysconfig/network-scripts/ifcfg-eno16777736

Get dirname of File path:

#dirname/etc/sysconfig/network-scripts/ifcfg-eno16777736

Linux file system