Ubuntu Newbie Guide: How to Use the cd Command?

This article introduces the use of the `cd` command in the Ubuntu system, which is a core tool for directory switching, similar to clicking on folders in Windows. **Basic Usage**: The format is `cd target_directory`. You can directly enter a subdirectory of the current directory (e.g., `cd Documents`), or access another user's home directory via `~username` (requires permissions, e.g., `cd ~root`). **Path Distinction**: Relative paths start from the current directory (`..` represents the parent directory, e.g., `cd ..`); absolute paths start from the root directory `/`. You can use `~` to refer to the home directory (e.g., `cd ~/Pictures`) or write the full path directly (e.g., `cd /usr/share/doc`). **Common Tips**: `cd -` returns to the previous directory, `cd ~` directly goes to the home directory, and `cd ..` returns to the parent directory. **Common Issues**: Directory does not exist or spelling error (case-sensitive, use `ls` to check); directories with spaces require quotes or backslashes (e.g., `cd "my docs"`); system directories requiring permissions use `sudo` (ordinary users should prioritize operating on their home directory). Finally, use `pwd` to confirm the current directory. Mastering paths and these techniques is sufficient.