CURL Command to Download and Save File. To simply download a file using curl use following syntax.O is used for saving file on the local system with the same name on the remote system. CURL Download and Save with Other Name. If you want to save file with different name on local system, Use -o with new file name.
-->Beginning in Insider Build 17063, we’re introducing two command-line tools to the Windows toolchain: curl and bsdtar. It’s been a long time coming, I know. We'd like to give credit to the folks who’ve created and maintain bsdtar and curl—awesome open-source tools used by millions of humans every day. Let's take a look at two impactful ways these tools will make developing on Windows an even better experience.
1. Developers! Developers! Developers!
Tar and curl are staples in a developer’s toolbox; beginning today, you’ll find these tools are available from the command-line for all SKUs of Windows. And yes, they're the same tools you've come to know and love! If you're unfamiliar with these tools, here's an overview of what they do:
- Tar: A command line tool that allows a user to extract files and create archives. Outside of PowerShell or the installation of third party software, there was no way to extract a file from cmd.exe. We're correcting this behavior :) The implementation we're shipping in Windows uses libarchive.
- Curl: Another command line tool that allows for transferring of files to and from servers (so you can, say, now download a file from the internet).
Now not only will you be able to perform file transfers from the command line, you'll also be able to extract files in formats in addition to .zip (like .tar.gz, for example). PowerShell does already offer similar functionality (it has curl and it's own file extraction utilities), but we recognize that there might be instances where PowerShell is not readily available or the user wants to stay in cmd.
2. The Containers Experience
Now that we’re shipping these tools inbox, you no longer need to worry about using a separate container image as the builder when targeting nanoserver-based containers. Instead, we can invoke the tools like so:
Background
We offer two base images for our containers: windowsservercore and nanoserver. The servercore image is the larger of the two and has support for such things as the full .NET framework. On the opposite end of the spectrum is nanoserver, which is built to be lightweight with as minimal a memory footprint as possible. It’s capable of running .NET core but, in keeping with the minimalism, we’ve tried to slim down the image size as much as possible. We threw out all components we felt were not mission-critical for the container image. PowerShell was one of the components that was put on the chopping block for our nanoserver image. PowerShell is a whopping 56 Mb (given that the total size of the nanoserver image is 200 Mb…that’s quite the savings!) But the consequence of removing PowerShell meant there was no way to pull down a package and unzip it from within the container. If you’re familiar with writing dockerfiles, you’ll know that it’s common practice to pull in all the packages (node, mongo, etc.) you need and install them. Instead, users would have to rely on using a separate image with PowerShell as the “builder” image to accomplish constructing an image. This is clearly not the experience we want our users to have when targeting nanoserver—they’d end up having to download the much larger servercore image. This is all resolved with the addition of curl and tar. You can call these tools from servercore images as well.
We want your Feedback!
Are there other developer tools you would like to see added to the command-line? Drop a comment below with your thoughts! In the mean time, go grab Insider Build 17063 and get busy curl’ing an tar’ing to your heart’s desire.
If you need to automatically download a file from a SFTP site, perhaps a regular news or traffic MP3, cURL may be the tool for you! These instructions explain the right versions of the software to download on Windows, and the correct commands to run.
Let’s assume you have a fairly recent Windows x64 version (Windows 7, Server 2008 R2, etc.)
There are two packages you need to download:
- cURL with SSH2, SSL and SSPI
- OpenSSL
These two tools can be used together to connect to SFTP sites and download specific files.
Step 1: Downloading cURL (with SSH2, SSL and SSPI) for Windows
cURL builds for Windows are distributed by paehl.com. On the downloads page, select the fourth version in the main list (“Download SSH2, SSL, SSPI version”).
Step 2: Downloading OpenSSL for Windows
OpenSSL for Windows builds are distributed by fulgan.com. On the download page, select the latest i386-win32 version. At the time of writing, this file was called “openssl-1.0.2h-i386-win32.zip”.
Step 3: Extracting the files
We need to get two files from each ZIP archive and put them into the one directory.
From the cURL download, find:
- curl.exe
- libssh2.dll
From the OpenSSL package:
- libeay32.dll
- ssleay32.dll
Create an empty directory on your local disk, and copy these four files into it.
Step 4: Install Visual C++ Redistributable (Optional)
You may need to install the Visual C++ Redistributable. If so, this can be downloaded directly from Microsoft.
Step 5: Running the Command
The command itself is fairly straightforward. The following example assumes you want to download a file called “NEWS_FULL.mp3” and save it as “news_output_full.mp3”:
Command Explanation
Here’s an explanation of the command line options:
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- -u myusername:mypassword
Specify the credentials you need to login to the SFTP server. If the credentials contain special characters, wrap the whole thing in double-quotation marks. - -k
This option is optional, but will allow you to connect to untrusted servers (self-signed certificates count as untrusted) - -o c:filedownloadnews_output_full.mp3
Specify the full output filename - sftp://myserver.mediarealm.com.au/home/myusername/NEWS_FULL.mp3
The last parameter is the source filename, with the full protocol, server, path and filename listed.
Automating this Command
To automatically run this command, save the full command as a BAT file and schedule it from the Windows Task Scheduler.