## Server Machine and Server Program { #server-machine-and-server-program }

There's a small detail about names to keep in mind. 💡

The word "**server**" is commonly used to refer to both the remote/cloud computer (the physical or virtual machine) and also the program that is running on that machine (e.g. Uvicorn).

---

Then the next concepts to consider are all about the program running your actual API (e.g. Uvicorn).

## Program and Process { #program-and-process }

We will talk a lot about the running "**process**", so it's useful to have clarity about what it means, and what's the difference with the word "**program**".

### What is a Program { #what-is-a-program }

The word **program** is commonly used to describe many things:

* `/bin`
* `/usr/sbin`
* `/sbin`

////

//// tab | উইন্ডোজ

```plaintext
C:\Program Files\Python312\Scripts;C:\Program Files\Python312;C:\Windows\System32
```

তারমানে হলো সিস্টেম প্রোগ্রামগুলোকে নিচের ডিরেক্টরিগুলোতে খুঁজবেঃ

* `C:\Program Files\Python312\Scripts`
* `C:\Program Files\Python312`
* `C:\Windows\System32`

////

-   `/usr/bin`
-   `/bin`
-   `/usr/sbin`
-   `/sbin`

////

//// tab | Windows

```plaintext
C:\Program Files\Python312\Scripts;C:\Program Files\Python312;C:\Windows\System32
```

這意味著系統應該在以下目錄中查找程式：

-   `C:\Program Files\Python312\Scripts`
-   `C:\Program Files\Python312`
-   `C:\Windows\System32`

////

當你在終端機中輸入一個**指令**時，作業系統會在 `PATH` 環境變數中列出的**每個目錄**中**查找**程式。

 * @author koichik
 */
public class ZipFileUtilTest extends TestCase {

    /**
     * @throws Exception
     */
    public void testToJarFilePath() throws Exception {
        final URL url = new URL(null, "zip:/Program Files/foo.zip!/", new URLStreamHandler() {
            @Override
            protected void parseURL(final URL u, final String spec, final int start, final int limit) {

-   `/bin`
-   `/usr/sbin`
-   `/sbin`

////

//// tab | Windows

```plaintext
C:\Program Files\Python312\Scripts;C:\Program Files\Python312;C:\Windows\System32
```

이는 시스템이 다음 디렉토리에서 프로그램을 찾아야 함을 의미합니다:

-   `C:\Program Files\Python312\Scripts`
-   `C:\Program Files\Python312`
-   `C:\Windows\System32`

////

* `/bin`
* `/usr/sbin`
* `/sbin`

////

//// tab | Windows

```plaintext
C:\Program Files\Python312\Scripts;C:\Program Files\Python312;C:\Windows\System32
```

Điều này có nghĩa là hệ thống sẽ tìm kiếm các chương trình trong các thư mục:

* `C:\Program Files\Python312\Scripts`
* `C:\Program Files\Python312`
* `C:\Windows\System32`

////

* `/bin`
* `/usr/sbin`
* `/sbin`

////

//// tab | Windows

```plaintext
C:\Program Files\Python312\Scripts;C:\Program Files\Python312;C:\Windows\System32
```

Это означает, что система должна искать программы в каталогах:

* `C:\Program Files\Python312\Scripts`
* `C:\Program Files\Python312`
* `C:\Windows\System32`

////

* `/usr/bin`
* `/bin`
* `/usr/sbin`
* `/sbin`

////

//// tab | Windows

```plaintext
C:\Program Files\Python312\Scripts;C:\Program Files\Python312;C:\Windows\System32
```

これは、OSはプログラムを見つけるために以下のディレクトリを探す、ということを意味します:

* `C:\Program Files\Python312\Scripts`
* `C:\Program Files\Python312`
* `C:\Windows\System32`

////

A `requirements.txt` with some packages could look like:

```requirements.txt
fastapi[standard]==0.113.0
pydantic==2.8.0
```

///

## Run Your Program { #run-your-program }

After you activated the virtual environment, you can run your program, and it will use the Python inside of your virtual environment with the packages you installed there.

<div class="termy">

```console
$ python main.py