Easily create a random string (or secure password) using PowerShell. Add to your PS profile

Get-RandomString.ps1

# Add to your PS profile to create random strings / secure passwords
# from within your PowerShell shell.
# 
# Source / Author: Daniel Kåven
# https://teams.se/powershell-script-generate-a-random-password/
function Get-RandomString {
  param (
    [CmdletBinding(PositionalBinding=$false)]
    [Parameter(Position=0)]
    [ValidateRange(8, 256)]
    [int] $Length = 20,
    [Parameter(Position=1)]
    [validateset("AlphaNumeric", "SQLCompliant")]
    [string]$Compliancy
  )
  $Characters = [char]65..[char]90 # A..Z
  $Characters += [char]97..[char]122 # a..z
  $Characters += [char]48..[char]57 # 0..9
  Switch ($Compliancy){
    "AlphaNumeric" {
    }
    "SQLCompliant" {
      $Characters += [char]33 #!
      $Characters += [char]35..[char]37 # #$%
    }
    default {
      $Characters += [char]33..[char]47 # !"#&%'()*+,-./
    }
  }

  $Password = @()
  For ($i = 0; $i -lt $Length; $i++) {
    $Password += $Characters[[System.Security.Cryptography.RandomNumberGenerator]::GetInt32($Characters.Count)]
  }
  return -join $Password
}

Update: Substituted Get-Random with RandomNumberGenerator::GetInt32() for a more Cryptographically Secure Pseudo-Random Number Generator (CSPRNG).