In my recent post about finding a missing integer in an array of numbers I didn’t spell out the assumptions. In this post I’ll explain those assumptions and show you how to Find a missing integer–alternative solution. The assumptions were: The sequence of numbers in the array starts at 1 The values increment by 1 […]
Continuing the thoughts about techniques for dealing with integer arrays – this is how to go about finding and removing duplicates from the array. First – to find any duplicates use Group-Object function get-duplicate { [CmdletBinding()] param ( [int[]]$iarray ) $iarray | Group-Object | where Count -gt 1 | foreach { New-Object -TypeName PSobject -Property […]
I stumbled across a set of programmer interview questions recently. They raised some interesting problems that I thought would be fun to show a PowerShell answer. This is the first of them – find a missing integer in an array. Consider an array of integers. It should have 10 members: $iarray = 1,2,3,4,5,6,7,8,9,10 But […]
If you try to do a directory listing through C:\Windows\system32 you’ll get some access denied errors. I’m going to show you how to do this while managing errors that arise. The code will also highlight a few of the PowerShell error handling techniques. $epath2 = $null Get-ChildItem -Path C:\Windows\System32 -Recurse -Force -Directory -ErrorVariable epath2 […]
The Test-Connection cmdlet wasn’t included in PowerShell v6.0 but did make a come back in v6.1. The v6.1 version of Test-Connection has some serious issues as I’ve described before. Work is being done at the moment to remedy those issues – hopefully for v6.2 This is your chance to comment on a cmdlet […]
DevOps has never really excited me and I never understood why until I read about DevOps team structures – https://web.devopstopologies.com/ The article suggests 7 bad practices or ‘anti-types: Dev and Ops Silos DevOps Team Silo Dev doesn’t need Ops DevOps as tools team Rebranded administrators Ops embedded in dev team Dev and DBA silos […]
PowerShell v6.2 preview 1 quietly appeared yesterday – https://github.com/PowerShell/PowerShell/releases No major breaking changes. New features include: Type accelerators for unsigned integers Support for cd+ Test-ModuleManifest update to correctly populate nested modules Set-Service –status stopped will also stop dependencies The Test-Connection and –workingdirectory issues are still unresolved. There’s nothing earth shattering in the updates but […]
PowerShell v6.1 introduced a very annoying change in that a –workingdirectory parameter was added to pwsh.exe. When you install v6.1 working directory is automatically set to ~ which is your home folder. The workingdirectory doesn’t play nice with your profile. In my profile I set the location to C:\scripts where I keep my work in […]
PowerShell uses a verb-noun style for naming cmdlets. The list of Powershell approved verbs is available at https://docs.microsoft.com/en-us/powershell/developer/cmdlet/approved-verbs-for-windows-powershell-commands. You should use the approved verbs when writing functions or cmdlets. Import-Module will complain about using unapproved verbs. You can also see the list of approved verbs using Get-Verb. There’s also a set of […]
I’ve shown how to discover network information using the get-internetconnection function and how to construct simple Pester tests to ping the IP addresses returned by get-internetconnection. This time I’ll show you how to create a control function for running ping tests. In fact the control script could be used to run any set of tests […]