> For the complete documentation index, see [llms.txt](https://moxwel.gitbook.io/basics/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://moxwel.gitbook.io/basics/first/command-notations.md).
# Command notations
When reading command documentation, you will see notations representing various conditions. Not every command must be copy-pasted, some needs to change values depending on what do you want.
## `>>> Input`
In some interactive shells, you will have this symbol (`>>>`) at the start of your cursor, it means the software is waiting for user input. In documentation, it means something you should write.
```python
>>> print("Hello world") # This is an input
Hello world # This is an output
```
It can also be like `>` or `$`.
## ``
Represents a value for which **you must supply a value**.
For example:
```
python my_script.py
```
You need to fill the place where `` is with your own value.
{% code title="Example" %}
```
python my_script.py my_file.txt
```
{% endcode %}
## `[Optional]`
Represents a value for which **you can supply a value or leave empty**.
For example:
```
python my_script.py [file]
```
It's not necessary to put something in `[file]`.
{% code title="Example" %}
```
python my_script.py my_file.txt
python my_script.py
```
{% endcode %}
## `{Mutually|Exclusive|Values}`
Represents a placeholder for which you must select one item of that list.
For example:
```
command {value1|value2|value3}
```
You should select only one value in that placeholder.
{% code title="Example" %}
```
command value1
command value2
command value3
```
{% endcode %}
## `--option`
Some commands let you add options (or flags) to change behavior. It can be with 1 dash (`-`) or 2 (`--`). Every command has their own way.
The `--help` or `-h` flag is very common in almost all commands. It shows information about the usage of a command. Use it everywhere you can.
```
python --help
```