Master the path representation in Linux system: absolute path and relative path

Master the path representation in the Linux system: absolute path and relative path

In the Linux system, path representation is a very important basic knowledge, especially for development personnel and system administrators. Path representation is mainly divided into two types: absolute path and relative path. This article will illustrate the difference and usage of these two path representations through specific code examples.

1. Absolute path

The absolute path is the complete path starting from the root directory, indicating the location of the file or directory in the entire file system. The absolute path starts with a slash "/", for example: /home/user/Documents, where "/" represents the root directory, followed by the directories at each level in the path. The absolute path is always fixed and is not affected by the current working directory.

In the terminal, you can use the following code example to view the current working directory and the absolute path of a file:

# 查看当前工作目录
pwd

# 查看某个文件的绝对路径
realpath filename

For example, if the current working directory is "/home/user", you want to view For the absolute path of the file "example.txt", you can execute the following command:

realpath example.txt

2. Relative path

The relative path is a path representation relative to the current working directory, and does not start with "/" beginning. Relative paths can more concisely represent the relative position relationship between the target file or directory and the current location. When using relative paths, you need to know your current location, otherwise path errors will occur.

For example, under the current working directory "/home/user", there is a subdirectory "Documents". To view the file "notes.txt" in this directory, you can use the relative path:

# 使用相对路径查看文件
cd Documents
cat notes.txt

In the above code example, first enter the "Documents" directory, and then view the file "notes.txt" in it.

Summary:

• The absolute path is the complete path starting from the root directory, starting with "/", and is always fixed.
• The relative path is a path representation relative to the current working directory, which does not start with "/" and is more concise.

By mastering the concepts and usage of absolute paths and relative paths, you can manage files and directories in the Linux system more flexibly and improve work efficiency.

The above is an introduction to mastering path representation in Linux systems. I hope it will be helpful to readers.

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