Pretty neat, huh? We can retrieve the name of a single object if we put its position in the array in the brackets [] on the command line. The array uses zero-offset indexing , meaning the object in the first position of the array is zero.
To access the last object in the array you can use -1; to get the second to last object in the array, you can use -2, and so on. Sometimes, the JSON object provides the number of elements in the array, which is the case with this one. Along with the array, it contains a key:name pair called number with a value of six. You can also provide a start and end object within the array.
Remember the array uses a zero-offset. To retrieve the objects from index position two, up to but not including the object at index position four, we type the following command:. This prints the objects at array index two the third object in the array and three the fourth object in the array. It stops processing at array index four, which is the fifth object in the array.
The way to better understand this is to experiment on the command line. The same as the Linux command line, jq uses the vertical bar to represent a pipe. We can use jq to create new objects, such as arrays. Note the opening [ and closing brackets ] are also the first and last characters in the filter string. You could also just ignore it. To delete the message key:value pair, we type this command:. If you need to create a new file without the message key:value pair in it, run the command, and then redirect the output into a new file.
As shown below, the file begins with an opening bracket [ , so the entire object is an array. The geolocation object contains further key:value pairs, and an array called coordinates.
With a slight change, we can extract the last 10 objects from the array. We can also apply slicing to strings. We can also see a specific object in its entirety. To do this, we type the following and include an array index without any key:value filters:.
To retrieve multiple values from each object, we separate them with commas in the following command:. For example, to reference the coordinates values, we have to include the all-encompassing array, the geolocation nested object, and the nested coordinates array, as shown below. To do that, pass the whole array to the select utility:. This filters the array to only include items that pass the test; in this case, does the name field contain a certain name?
This can be any boolean expression, even arithmetic ones like select. You can make objects simply by wrapping them in curly brackets, and pass jq statements as the values.
For example:. While this is useful for stripping out only the information you want, you can also construct new objects using jq commands. Since this is a learning-by-doing article, there are some prerequisites to ensure that you can follow the examples.
Below are the basic requirements. There are four methods to use PowerShell to download files that do not depend on third-party tools. These are:.
Whichever one of these four methods you use, the logic and components to make them work are the same. If required by the webserver, you need to enter the credentials as well. The next sections show each of these four methods. Whether the source location requires users to log in, the Invoke-WebRequest cmdlet can handle requests with credentials as well.
To download a file, the syntax below shows the minimum parameters required to achieve the desired outcome. For example, the code below downloads a file with the name 10MB. You may copy the code below and paste it into your PowerShell session to test. The demonstration below shows the expected result after running the code above in PowerShell. As you can see, the file download was successful. How about if the source requires authentication before allowing access?
For example, the code below downloads a file from a private website where users must log in. If authentication is required, you should add a credential to the request using the -Credential parameter. As you can see, the Get-Credential cmdlet prompted a PowerShell credential request. This time, using the credential with Invoke-WebRequest resulted in a successful download. A crucial thing to remember when using Invoke-WebRequest in Windows PowerShell is that, by default, this cmdlet uses the Internet Explorer engine to parse data.
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On Windows If you right click and press "save" Alternatively use ctrl-s and then chose the file format "json" when saving. On macOS You can do this in a few ways, I'd suggest using curl. Improve this answer. Maximilian Maximilian 3 3 silver badges 15 15 bronze badges. On Mac OS apple silicon you will need: "curl somedomain. Sign up or log in Sign up using Google. Sign up using Facebook. Sign up using Email and Password.
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