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Articles on Trending Technologies
Technical articles with clear explanations and examples
How to read all files in a folder to a single file using Java?
The listFiles() method of the File class returns an array holding the objects (abstract paths) of all the files (and directories) in the path represented by the current (File) object.To read the contents of all the files in a folder into a single file −Create a file object by passing the required file path as a parameter.Read the contents of each file using Scanner or any other reader.Append the read contents into a StringBuffer.Write the StringBuffer contents into the required output file.Exampleimport java.io.DataOutputStream; import java.io.File; import java.io.FileOutputStream; import java.io.IOException; import java.util.Scanner; public class Test { public static void main(String ...
Read MoreHow to check for duplicates in data.table object in R?
The checking for duplicates in a data.table object can be easily done with the help of delta ($) operator that is used to access the columns and the duplicated function. For example, if a data.table object DT contains a column x then to check the duplicates in x, we can use the command duplicated(DT$x).Example1Loading data.table object and creating an object −library(data.table) set.seed(141) x
Read MoreHow to get the list of jpg files in a directory in Java?
The String[] list(FilenameFilter filter) method of a File class returns a String array containing the names of all the files and directories in the path represented by the current (File) object. But the retuned array contains the filenames which are filtered based on the specified filter. The FilenameFilter is an interface in Java with a single method.accept(File dir, String name)To get the file names based on extensions implement this interface as such and pass its object to the above specified list() method of the file class.Assume we have a folder named ExampleDirectory in the directory D with 7 files and 2 directories ...
Read MoreHow to check if the string contains the specific word?
To check if the PowerShell string contains a specific word, we can use the string method Contains(). For example, ExamplePS C:\> $str = 'TestNZ01LT' PS C:\> $str.Contains('NZ') TrueNow the funny thing is, even if the PowerShell is case-Insensitive, the above command is not. We need to provide the exact substring. For example, the below output will be false.ExamplePS C:\> $str.Contains('Nz') FalseTo overcome this problem, we can either provide the same search name in the method or we need to use the lowercase or uppercase method if you don’t want the search case-sensitive.PS C:\> $str = 'TestNZ01LT' PS C:\> ($str.ToLower()).Contains(('Nz').ToLower()) True ...
Read MoreHow to convert command output to the Hashtable format in PowerShell?
To convert any command output to the hashtable in PowerShell, we can first convert the output to the JSON format using the ConvertTo-JSON command, and applying the ConvertFrom-JSON command from the first output will produce an output to the Hashtable.ExampleGet-ServiceThe above command will give the output in the array format.OutputStatus Name DisplayName ------ ---- ----------- Stopped WwanSvc WWAN AutoConfig Stopped XblAuthManager Xbox Live Auth Manager Stopped XblGameSave Xbox Live Game Save Stopped XboxGipSvc Xbox Accessory Management Service Stopped XboxNetApiSvc Xbox Live ...
Read MoreHow to exclude the RunSpaceID property from the Invoke-Command output in PowerShell?
When we write Invoke-Command in PowerShell, sometimes we get the RunSpaceID property in PowerShell. This is because we use Select-Object (alias: Select) command inside the scriptblock. For example,ExampleInvoke-Command -ComputerName LabMachine2k12 -ScriptBlock{Get-Process PowerShell | Select Name, CPU, WorkingSet}OutputName : powershell CPU : 9.1572587 WorkingSet : 127700992 PSComputerName : LabMachine2k12 RunspaceId : c690f205-06d4-4cc4-be29-5302725eadf1To avoid getting the RunSpaceID property in the output, use the Select command output the scriptblock. For example,ExampleInvoke-Command -ComputerName LabMachine2k12 -ScriptBlock{Get-Process PowerShell} | Select Name, CPU, WorkingSetOutputName CPU WorkingSet ---- --- ---------- powershell 9.1572587 127700992
Read MoreHow to exclude PSComputerName property from Invoke-Command output in PowerShell?
When we are working with Invoke-Command, we get the PSComputerName extra field in the output table. You can remove it by using -HideComputerName parameter. For example, the Below command gives the output with the PSComputerName property.ExampleInvoke-Command -ComputerName LabMachine2k12 -ScriptBlock{Get-Service Winrm} | ft -AutoSizeOutputStatus Name DisplayName PSComputerName ------ ---- ----------- -------------- Running Winrm Windows Remote Management (WS-Management) LabMachine2k12To hide the PSComputerName property,ExampleInvoke-Command -ComputerName LabMachine2k12 -ScriptBlock{Get-Service Winrm} -HideComputerNameOutputStatus Name DisplayName ------ ---- ----------- Running Winrm Windows Remote Management (WS-Management)
Read MoreHow to get the Windows certificate details using PowerShell?
We know that the Windows Certificates are resided in the Certificate store but finding the certificate with its name or getting particular certificate details might be cumbersome sometimes.You can access the certificate store using MMC or using CertMgr.msc command. There are certificates stored for CurrentUser, ServiceAccount, and Local Computer. To access the certificate store using PowerShell, you need to access the PSDrive, and Certificates are stored in the drive called Cert as you can see below.PS C:\> Get-PSDrive cert | ft -AutoSize Name Used (GB) Free (GB) Provider Root CurrentLocation ---- --------- --------- -------- ---- --------------- Cert Certificate \Let say ...
Read MoreHow to check if PSCustomObject is empty in PowerShell?
To check if the PSCustomObject is empty or not in PowerShell, we need to check the fields of the PSCustomObject. Consider the below example, Example$output = [PSCustomObject]@{ Name = 'John' City = 'New York' Country = 'US' Company = 'Alpha' } $output1 = [PSCustomObject]@{ Name = '' City = '' Country = '' Company = '' }OutputPS C:\WINDOWS\system32> $output Name City Country Company ---- ---- ------- ------- John New York US Alpha PS C:\WINDOWS\system32> $output1 Name City Country Company ...
Read MoreHow to delete all the file contents using PowerShell?
If you want to delete the entire text file content using PowerShell, then we can use the Clear-Content command. For example, we have the below text file called Locations.txt on the C:\Temp path. You can check the content using the below file.Get-Content C:\temp\locations.txtTo clear the file content, we can use the below command.Clear-Content C:\Temp\locations.txt -Force-Force switch is used to clear the contents without user confirmation.When you use this command with the pipeline in the Get-Content command, it will generate an IO Exception error that the file is in use because we are already retrieving the contents using Get-Content and then ...
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