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To get the user sessions on the remote computers using PowerShell, we need to use the cmd query command. First of all, we will get the user sessions on the local computer using the below command.Examplequery sessionOutputLet’s see what are other supported parameters for the query session command.ExamplePS C:\> query session /? Display information about Remote Desktop Services sessions. QUERY SESSION [sessionname | username | sessionid] [/SERVER:servername] [/MODE] [/FLOW] [/CONNECT] [/COUNTER] [/VM] sessionname Identifies the session named sessionname. username Identifies the session ... Read More
Like any other data type conversion in PowerShell, we can convert Dictionary to hashtable in a similar way. We have a below Dictionary for the example called $CityData.Key Value --- ----- India 91 Austria 43Its datatype is Dictionary,ExamplePS C:\> $citydata.GetType() | ft -AutoSizeOutputIsPublic IsSerial Name BaseType -------- -------- ---- -------- True True Dictionary`2 System.ObjectTo convert it to the hashtable,$hash = [Hashtable]$citydataOr$hash = [System.Collections.Hashtable]$CityDataDatatype:PS C:\> $hash | ft -AutoSizeOutputName Value ---- ----- Austria 43 India 91
PowerShell programmers generally prefer the Hashtable over the Dictionary although there are some advantages of using Dictionary. See the difference below.a. Hashtable is easy to declare while the Dictionary is a little complex compared to Hashtable. For example, To create a hashtable, $hash = @{ 'Country' = 'India' 'Code' = '91' }To create a Dictionary, $citydata = New-Object System.Collections.Generic.Dictionary"[String, Int]" $citydata.Add('India', 91) b. Hashtable is included in the namespace called Collections while Dictionary is included in the namespace called System.Collections.Generic namespace. Hashtable is non-generic so it can be a collection of different data types and Dictionary belongs to a generic class so it is ... Read More
To create a dictionary in the PowerShell we need to use the class Dictionary from the .Net namespace System.Collections.Generic. It has TKey and TValue. Its basic syntax isDictionaryTo learn more about this .Net namespace check the link below.https://docs.microsoft.com/en-us/dotnet/api/system.collections.generic.dictionary-2?view=net-5.0To create a dictionary we will first create the object for the dictionary object class with the datatypes. In the below example, we need to add the Country name and the country code. So we need String and Int.$countrydata = New-Object System.Collections.Generic.Dictionary"[String, Int]"Once we check the type of the $countrydata variable, it should be the dictionary. For example, ExamplePS C:\> $Countrydata.GetType() | ft -AutoSizeOutputIsPublic ... Read More
To convert the JSON file to the CSV file using PowerShell, we need to use the ConvertTo-CSV command as a pipeline.For example, we have a JSON file called PatchingServer.JSON stored at C:\temp and its content is as below.ExamplePS C:\> Get-Content C:\Temp\PatchingServer.json { "Port": "9000", "ApplicationName": "TestApp", "MaintenanceWindow": "Every Saturday", "BusinessUnit": "IT", "AppOwner": "Josh", "AppID": "1jj2221-223443s", "Location": "EastUS" }We need to convert the above file to the CSV file so we will use the ConvertTo-CSV command but before that, we need the JSON file need to be converted from JSON format to table format using ... Read More
Windows Product key can be retrieved using PowerShell or CMD. To retrieve the product key using PowerShell, we need to query SoftwareLicesingService class and there is a property called OA3xOriginalProductKey which stores the product key.ExampleGet-WmiObject -query `select * from SoftwareLicensingService' | Select OA3xOriginalProductKeyOutputOA3xOriginalProductKey ---------------------- BBBBB-CSDSC-EESSR-KKIDS-AAAAAWe can also query this WMI class using cmd as shown below.wmic path softwarelicensingservice get OA3xOriginalProductKeyCaution: It may or may not work for all the Windows OS. The above is tested in Windows 10.
Generally, Product serial numbers are available at the back of the laptop on the company sticker and we can use the Third-party or manufacturer software to find the Product details. The product serial number can also be found using the BIOS utility or command. We can either use the BIOS command for the cmd or using PowerShell.To get the product serial number using PowerShell, we can use WMI or CIMInstance command. For example, ExampleGet-CimInstance Win32_BIOSWe can also use the WMI command. For example, ExampleGet-WmiObject Win32_BIOSOutputSMBIOSBIOSVersion : F.13 Manufacturer : AMI Name : ... Read More
Suppose we have one directed acyclic graph represented by the adjacency list. We have to find the longest path in the graph without node repetition.So, if the input is likethen the output will be 4, as the path is 0 -> 1 -> 3 -> 4 -> 2 with length 4.To solve this, we will follow these steps −ans := 0n := node count of graphtable := a list of size n and fill with -1Define a function dfs() . This will take uif table[u] is not -1, thenreturn table[u]p_len := 0for each vectex v in graph[u], dop_len := maximum ... Read More
Suppose we have a 2D matrix, we have to find the length of the longest strictly increasing path. To traverse the path we can move up, down, left, or right nor diagonally.So, if the input is like246157339then the output will be 6, as The longest path is [1, 2, 4, 6, 7, 9]To solve this, we will follow these steps −n := row count of matrix , m := column count of matrix moves := a list of pairs to move up, down, left and right [[1, 0], [-1, 0], [0, 1], [0, -1]] Define a function dp() . This ... Read More
Suppose we have a lowercase string s; we have to find the length of the longest palindromic subsequence in s.So, if the input is like s = "aolpeuvekyl", then the output will be 5, as the palindrome is "level".To solve this, we will follow these steps −n := size of sDefine a function dp() . This will take i, jif i is same as j, thenreturn 1otherwise when i > j, thenreturn 0otherwise, if s[i] is same as s[j], thenreturn 2 + dp(i + 1, j - 1)otherwise, return maximum of dp(i + 1, j) and dp(i, j - 1)return ... Read More