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  • Axel 快速下载

    Axel 是一个轻量级下载程序，它和其他加速器一样，对同一个文件建立多个连接，每个连接下载单独的文件片段以更快地完成下载。

    Axel 支持 HTTP、HTTPS、FTP 和 FTPS 协议。它也可以使用多个镜像站点下载单个文件，所以，Axel 可以加速下载高达 40％（大约，我个人认为）。它非常轻量级，因为它没有依赖并且使用非常少的 CPU 和内存。

    Axel 一步到位地将所有数据直接下载到目标文件（LCTT 译注：而不是像其它的下载软件那样下载成多个文件块，然后拼接）。

    注意：不支持在单条命令中下载两个文件。

    你还可以尝试其他命令行下载管理器/加速器。

    大多数发行版（Debian、Ubuntu、Mint、Fedora、suse、openSUSE、Arch Linux、Manjaro、Mageia 等）都有 axel 包，所以我们可以从发行版官方仓库轻松安装。对于 CentOS/RHEL，我们需要启用 EPEL Repository。

    1. [在 Debian/Ubuntu/LinuxMint 上安装 Axel]
    2. $ sudo apt-get install axel
    4. [在 RHEL/CentOS 上安装 Axel]
    5. $ sudo yum install axel
    7. [在 Fedora 上安装 Axel]
    8. $ sudo dnf install axel
    10. [在 openSUSE 上安装 Axel]
    11. $ sudo zypper install axel
    13. [在 Mageia 上安装 Axel]
    14. $ sudo urpmi axel
    16. [在基于 Arch Linux 的发行版安装 Axel]
    17. $ sudo pacman -S axel

    1) 下载单个文件

    以下命令将从给定的 URL 下载文件并存储在当前目录中，下载文件时，我们可以看到文件的信息（建立的连接数、下载速度、下载进度、完成下载所花费的时间以及连接完成的时间）。

    1. # axel https://download.owncloud.org/community/owncloud-9.0.0.tar.bz2
    2. Initializing download: https://download.owncloud.org/community/owncloud-9.0.0.tar.bz2
    3. File size: 22678208 bytes
    4. Opening output file owncloud-9.0.0.tar.bz2
    5. Starting download
    7. [ 0%] .......... .......... .......... .......... .......... [ 146.7KB/s]
    8. [ 0%] .......... .......... .......... .......... .......... [ 267.0KB/s]
    9. [ 0%] .......... .......... .......... .......... .......... [ 373.9KB/s]
    10. [ 0%] .......... .......... .......... .......... .......... [ 406.9KB/s]
    11. [ 0%] .......... .......... .......... .......... .......... [ 487.5KB/s]
    12. [ 1%] .......... .......... .......... .......... .......... [ 572.6KB/s]
    13. [ 1%] .......... .......... .......... .......... .......... [ 650.7KB/s]
    14. [ 1%] .......... .......... .......... .......... .......... [ 649.3KB/s]
    15. [ 1%] .......... .......... .......... .......... .......... [ 718.1KB/s]
    16. [ 2%] .......... .......... .......... .......... .......... [ 769.3KB/s]
    17. [ 2%] .......... .......... .......... .......... .......... [ 838.7KB/s]
    18. [ 2%] .......... .......... .......... .......... .......... [ 866.0KB/s]
    19. Connection 0 finished
    20. .
    21. .
    22. [ 99%] .......... .......... .......... .......... .......... [5721.0KB/s]
    23. Connection 2 finished
    24. [ 99%] .......... .......... .......... .......... .......... [5733.4KB/s]
    25. Connection 1 finished
    26. [ 99%] .......... .......... .......... .......... .......... [5745.4KB/s]
    27. [100%] .......... .......... .......... .......... ......
    29. Downloaded 21.6 megabytes in 3 seconds. (5755.94 KB/s)

    2) 用不同的名称保存文件

    要使用其他名称来保存文件，启动下载时可以添加 -o（小写字母）选项和文件名。这里我们使用文件名 owncloud.tar.bz2 来保存文件。

    1. # axel -o cloud.tar.bz2 https://download.owncloud.org/community/owncloud-9.0.0.tar.bz2
    2. Initializing download: https://download.owncloud.org/community/owncloud-9.0.0.tar.bz2
    3. File size: 22678208 bytes
    4. Opening output file cloud.tar.bz2
    5. Starting download
    7. [ 0%] .......... .......... .......... .......... .......... [ 143.0KB/s]
    8. [ 0%] .......... .......... .......... .......... .......... [ 264.1KB/s]
    9. [ 0%] .......... .......... .......... .......... .......... [ 309.8KB/s]
    10. [ 0%] .......... .......... .......... .......... .......... [ 406.3KB/s]
    11. [ 0%] .......... .......... .......... .......... .......... [ 495.4KB/s]
    12. [ 1%] .......... .......... .......... .......... .......... [ 586.3KB/s]
    13. [ 1%] .......... .......... .......... .......... .......... [ 673.1KB/s]
    14. [ 1%] .......... .......... .......... .......... .......... [ 647.1KB/s]
    15. [ 1%] .......... .......... .......... .......... .......... [ 721.1KB/s]
    16. [ 2%] .......... .......... .......... .......... .......... [ 781.3KB/s]
    17. Connection 2 finished
    18. .
    19. .
    20. Connection 0 finished
    21. [ 98%] .......... .......... .......... .......... .......... [6221.9KB/s]
    22. [ 98%] .......... .......... .....
    23. Connection 1 finished
    24. ,,,,,,,,,, ,,,,,,,,,, ,,,,,..... .......... .......... [6145.6KB/s]
    25. [ 99%] .......... .......... .......... .......... .......... [6159.2KB/s]
    26. [ 99%] .......... .......... .......... .......... .......... [6172.0KB/s]
    27. [ 99%] .......... .......... .......... .......... .......... [5977.9KB/s]
    28. [ 99%] .......... .......... .......... .......... .......... [5989.6KB/s]
    29. [100%] .......... .......... .......... .......... ......
    31. Downloaded 21.6 megabytes in 3 seconds. (6001.05 KB/s)

    3) 限制下载速度

    默认情况下 axel 以字节/秒为单位设置下载文件的最大速度。当我们的网络连接速度较慢时，可以使用此选项。只需添加 -s 选项，后面跟字节值。这里我们要限速 512 KB/s 下载一个文件。

    1. # axel -s 512000 https://download.owncloud.org/community/owncloud-9.0.0.tar.bz2
    2. Initializing download: https://download.owncloud.org/community/owncloud-9.0.0.tar.bz2
    3. File size: 22678208 bytes
    4. Opening output file owncloud-9.0.0.tar.bz2
    5. Starting download
    7. [ 0%] .......... .......... .......... .......... .......... [ 141.5KB/s]
    8. [ 0%] .......... .......... .......... .......... .......... [ 266.1KB/s]
    9. [ 0%] .......... .......... .......... .......... .......... [ 308.0KB/s]
    10. [ 0%] .......... .......... .......... .......... .......... [ 405.9KB/s]
    11. [ 0%] .......... .......... .......... .......... .......... [ 496.7KB/s]
    12. [ 1%] .......... .......... .......... .......... .......... [ 526.4KB/s]
    13. [ 1%] .......... .......... .......... .......... .......... [ 507.0KB/s]
    14. [ 1%] .......... .......... .......... .......... .......... [ 505.6KB/s]
    15. [ 1%] .......... .......... .......... .......... .......... [ 504.8KB/s]
    16. [ 2%] .......... .......... .......... .......... .......... [ 503.9KB/s]
    17. [ 2%] .......... .......... .......... .......... .......... [ 503.4KB/s]
    18. .
    19. .
    20. [ 99%] .......... .......... .......... .......... .......... [ 497.0KB/s]
    21. [ 99%] .......... .......... .......... .......... .......... [ 496.9KB/s]
    22. [100%] .......... ..
    23. Connection 0 finished
    24. ,,,,,,,,,, ,,.....
    25. Connection 1 finished
    26. Connection 3 finished
    27. ,,,,,,,,,, ,,,,,,,... .......... .......... ......
    29. Downloaded 21.6 megabytes in 44 seconds. (494.54 KB/s)

    4) 限制连接数

    axel 默认建立 4 个连接以从不同的镜像获取文件。此外，我们可以通过使用 -n 选项添加更多的连接，后跟连接数 10 来提高下载速度。保险起见，我们添加了十个连接，但不幸的是，它花了更多时间来下载文件。

    1. # axel -n 10 https://download.owncloud.org/community/owncloud-9.0.0.tar.bz2
    2. Initializing download: https://download.owncloud.org/community/owncloud-9.0.0.tar.bz2
    3. File size: 22678208 bytes
    4. Opening output file owncloud-9.0.0.tar.bz2
    5. Starting download
    7. [ 0%] .......... .......... .......... .......... .......... [ 140.8KB/s]
    8. [ 0%] .......... .......... .......... .......... .......... [ 265.7KB/s]
    9. [ 0%] .......... .......... .......... .......... .......... [ 305.4KB/s]
    10. [ 0%] .......... .......... .......... .......... .......... [ 402.1KB/s]
    11. [ 0%] .......... .......... .......... .......... .......... [ 496.3KB/s]
    12. [ 1%] .......... .......... .......... .......... .......... [ 522.1KB/s]
    13. [ 1%] .......... .......... .......... .......... .......... [ 567.5KB/s]
    14. [ 1%] .......... .......... .......... .......... .......... [ 640.5KB/s]
    15. [ 1%] .......... .......... .......... .......... .......... [ 710.8KB/s]
    16. [ 2%] .......... .......... .......... .......... .......... [ 780.5KB/s]
    17. .
    18. .
    19. [ 98%] .......... .......... .......... .......... .......... [7544.9KB/s]
    20. [ 98%] .......... .......... .......... .......... .......... [7557.9KB/s]
    21. [ 98%] .......... .......... .......... .......... .......... [7570.4KB/s]
    22. [ 98%] .......... .......... .......... .......... .......... [7495.3KB/s]
    23. [ 99%] .......... .......... .......... .......... ......
    24. Connection 2 finished
    25. ,,,,,,,,,, ,,,,,,,,,, ,,,,,,,,,, ,,,,,,,,,, ,,,,,,.... [7311.6KB/s]
    26. [ 99%] .......... .......... .......... .......... .......... [7318.9KB/s]
    27. [ 99%] .......... .......... .......... .......... ..........
    28. Connection 9 finished
    29. ,,,,,,,,,, ,,,,,,,,,, ,,,,,,,,,, ,,,,,,,,,, ,,,,,,,,,, [7331.0KB/s]
    30. [ 99%] .......... .......... .......... ..........
    31. Connection 3 finished
    32. ,,,,,,,,,, ,,,,,,,,,, ,,,,,,,,,, ,,,,,,,,,, .......... [4300.7KB/s]
    33. [100%] .......... .......... .......... .......... ......
    35. Downloaded 21.6 megabytes in 5 seconds. (4109.41 KB/s)

    5) 恢复未完成的下载

    axel 默认具有恢复未完成的下载的行为。Axel 在下载文件时定期更新状态文件（扩展名为 .st）。由于某些原因，下载中途停止了？不用担心，只要使用相同的 axel 命令，它将会检查 file 和 file.st，如果找到，它会从停止处恢复下载。

    1. # axel https://download.owncloud.org/community/owncloud-9.0.0.tar.bz2
    2. Initializing download: https://download.owncloud.org/community/owncloud-9.0.0.tar.bz2
    3. File size: 22678208 bytes
    4. Opening output file owncloud-9.0.0.tar.bz2
    5. Starting download
    7. [ 0%] .......... .......... .......... .......... .......... [ 140.8KB/s]
    8. [ 0%] .......... .......... .......... .......... .......... [ 265.7KB/s]
    9. [ 0%] .......... .......... .......... .......... .......... [ 305.4KB/s]
    10. [ 0%] .......... .......... .......... .......... .......... [ 402.1KB/s]
    11. [ 0%] .......... .......... .......... .......... .......... [ 496.3KB/s]
    12. [ 1%] .......... .......... .......... .......... .......... [ 522.1KB/s]
    13. [ 1%] .......... .......... .......... .......... .......... [ 567.5KB/s]
    14. [ 1%] .......... .......... .......... .......... .......... [ 640.5KB/s]
    15. [ 1%] .......... .......... .......... .......... .......... [ 710.8KB/s]
    16. [ 2%] .......... .......... .......... .......... .......... [ 780.5KB/s]
    17. .
    18. .
    19. [ 84%] .......... .......... .......... .......... .......... [7100.7KB/s]
    20. [ 84%] .......... .......... .......... .......... .......... [7104.3KB/s]
    21. [ 84%] .......... .......... .......... .^C
    23. Downloaded 18.3 megabytes in 2 seconds. (7009.79 KB/s)

    上面的输出清晰地显示了在下载断开时有两个文件 owncloud-9.0.0.tar.bz2 和 owncloud-9.0.0.tar.bz2.st。当重新开始下载时，它会从停止处开始下载。

    1. # ls -lh
    2. total 19M
    3. -rw------- 1 root root 22M Dec 27 08:33 owncloud-9.0.0.tar.bz2
    4. -rw------- 1 root root 44 Dec 27 08:33 owncloud-9.0.0.tar.bz2.st
    6. # axel https://download.owncloud.org/community/owncloud-9.0.0.tar.bz2
    7. Initializing download: https://download.owncloud.org/community/owncloud-9.0.0.tar.bz2
    8. File size: 22678208 bytes
    9. Opening output file owncloud-9.0.0.tar.bz2
    10. State file found: 19180828 bytes downloaded, 3497380 to go.
    11. Starting download
    13. ,,,,,,,,,, ,,,,,,,,,, ,,,,,,,,,, ,......... .......... [ 66.5KB/s]
    14. [ 84%] .......... .......... .......... .......... .......... [ 186.0KB/s]
    15. [ 85%] .......... .......... .......... .......... .......... [ 241.7KB/s]
    16. [ 85%] .......... .......... .......... .......... .......... [ 335.6KB/s]
    17. [ 85%] .......... .......... .......... .......... .......... [ 351.5KB/s]
    18. [ 85%] .......... .......... .......... .......... .......... [ 427.1KB/s]
    19. [ 85%] .......... .......... .......... .......... .......... [ 427.4KB/s]
    20. [ 86%] .......... .......... .......... .......... .......... [ 491.5KB/s]
    21. .
    22. .
    23. [ 98%] ...
    24. Connection 0 finished
    25. ,,,....... .......... .......... .......... .......... [2106.6KB/s]
    26. [ 99%] .......... .......... .......... .......... .......... [2140.5KB/s]
    27. [ 99%] .......... .......... .......... .......... .......... [2172.4KB/s]
    28. [ 99%] .......... .......... .......... .......... .......... [2203.2KB/s]
    29. [ 99%] .......... .......... .......... .......... .......... [2236.2KB/s]
    30. [100%] .......... .......... .......... .......... ......
    32. Downloaded 3415.4 kilobytes in 1 second. (2264.93 KB/s)

    6) 不显示文件下载进度

    如果你不想要看到文件的下载进度，只要在 axel 命令中加入 -q 选项。

    1. # axel -q https://download.owncloud.org/community/owncloud-9.0.0.tar.bz2

    7) 替换进度条

    如果你不喜欢默认的进度条，你可以使用 -a 选项来替换进度条。

    1. # axel -a https://download.owncloud.org/community/owncloud-9.0.0.tar.bz2
    2. Initializing download: https://download.owncloud.org/community/owncloud-9.0.0.tar.bz2
    3. File size: 22678208 bytes
    4. Opening output file owncloud-9.0.0.tar.bz2
    5. Starting download
    7. [ 66%] [......0 ...1 ..........2 ...........3] [ 5.8MB/s] [00:01]^C
    9. Downloaded 14.3 megabytes in 2 seconds. (5916.11 KB/s)

    我们中断了上面的下载，以便在下载文件时能清楚地显示替代进度条状态。一旦文件成功下载后，你可以看到相同的输出，如下所示。

    1. # axel -a https://download.owncloud.org/community/owncloud-9.0.0.tar.bz2
    2. File size: 22678208 bytes
    3. Opening output file owncloud-9.0.0.tar.bz2
    4. Starting download
    6. Connection 2 finished ]
    7. Connection 1 finished ]
    8. Connection 3 finished ]
    9. Connection 0 finished ]
    11. Downloaded 21.6 megabytes in 4 seconds. (5062.32 KB/s)

    8) 了解关于 axel 的更多信息

    如果你想要了解更多关于 axel 的选项，只需要进入它的手册。

    1. # man axel
    2. 或者
    3. # axel --help

    享受吧……
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  • 原文地址：https://www.cnblogs.com/gaoyuechen/p/9304352.html
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