What do "~", "/" and "./" in Linux represent?

~ represents the home directory, which is the user directory of the currently logged in user.

For example: My logged-in user is chen

cd ~

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~ represents /home/chen /. Of course, the premise is that there is a user directory. If there is no /home/chen directory, the situation will be more complicated.

/ refers to the root directory: the top-level directory of all directories.

./ represents the current directory. ./ generally needs to be used in conjunction with other folders or files to refer to things in the current directory.

cd . 没有太多意义
cd ./文件夹   切换到当前目录的某个文件夹

.. indicates the superior directory

cd ..         切换到上级目录   
cd ../文件夹    切换到上级目录中的某个文件夹

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