2. Navigation

The command cd (change directory) is used to move from one directory to another. The command pwd (print working directory) shows the current location. The command ls (list) shows the content of the current working directory.

Display the current working directory with pwd (print working directory):
```
pwd
```
List the contents of a directory:
```
ls /
```
```
ls /usr
```
```
ls -l /usr
```
Change the current working directory:
```
cd /usr
```
```
pwd
```
```
ls
```
```
cd /usr/bin
```
```
pwd
```
The path /usr/bin is called absolute, since it shows the full path, starting from the root (/).
Go to the directory one level up:
```
cd ..
```
```
pwd
```
Two dots (..) represent the parent of the current directory.

By the way, a single dot (.) represents the current directory:
```
cd .
```
```
pwd
```
Use a relative path:
```
cd bin
```
```
pwd
```
The directory bin is relative to the current one (in this case /usr).
Go to the previous current directory:
```
cd /var/log
```
```
cd -
```
```
cd -
```
Go to the home directory:
```
cd
```
```
cd ~
```
The tilde (~) represents the home directory of the current user.

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