Bijay Kumar 
To remove items from an array in PowerShell, build a new array without them and assign it back. Where-Object does this in one line: Output: PowerShell arrays have a fixed size, so you can’t delete an item in place. I ran every example in PowerShell 7.6 and Windows PowerShell 5.1 and note the one 7-only … Read more
To print an array in PowerShell, type the variable name or pass it to Write-Output, and every item prints on its own line. For a single line, join the items with -join: That covers most cases, but arrays of objects, hashtables and files behave differently. I ran each example below in PowerShell 7 and Windows … Read more
To compare two arrays in PowerShell, use Compare-Object. It lists the items that are only in one array: <= means only in the first (reference) array, and => only in the second: Output: WEB02 and web02 matched, because Compare-Object ignores case and order. I ran every example in PowerShell 7.6 and Windows PowerShell 5.1, with … Read more
To create an array of objects in PowerShell, put [pscustomobject]@{ … } entries inside @( ), one per line. Each object’s keys become its properties: Output: PowerShell shows the array as a table, with one row per object. I ran every example in PowerShell 7.6 and Windows PowerShell 5.1 and note the two places they … Read more
To make a PowerShell array parameter, give the parameter an array type such as [string[]]. Callers can then pass several values separated by commas, or just one value: Output: With [string[]], a single value still arrives as an array with one item, so the same foreach loop handles both calls. I tested every example in … Read more
A multidimensional array in PowerShell is usually an array of arrays, called a jagged array. Each inner array is a row, and you read a value with two indexes, $array[row][column]: Output: PowerShell also has true two-dimensional arrays like [int[,]], covered further down. I ran every example in PowerShell 7.6 and Windows PowerShell 5.1, with the … Read more
To remove duplicates from an array in PowerShell, pipe it to Select-Object -Unique. It keeps the first copy of each value, in the original order: Output: Notice that Austin and austin both stayed. Select-Object -Unique is case-sensitive, and each method treats case and order differently. I ran every example in PowerShell 7.6 and Windows PowerShell … Read more
To join arrays in PowerShell, use the plus operator. It returns a new array with every item from the first array followed by every item from the second: If you want one string instead of one array, use $all -join ‘, ‘. I’ll cover both below, plus the traps I hit when one side holds … Read more
To append to an array in PowerShell, use the += operator. It adds the new item to the end, so a list of two servers becomes three: Output: That’s all you need for small scripts. But += doesn’t really grow the array. It builds a brand-new one each time, which explains most of the surprises … Read more
To sort an array in PowerShell, pipe it to Sort-Object. It sorts in ascending order, A to Z and smallest to largest, and ignores case. Add -Descending to reverse it: Output: I ran every example in PowerShell 7.6 and Windows PowerShell 5.1. Most results match, but a few sorts differ between the versions, and I … Read more