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

Get-RandomString.ps1

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..90)      # A..Z
  $Characters += [char[]](97..122)    # a..z
  $Characters += [char[]](48..57)     # 0..9
  Switch ($Compliancy){
    "AlphaNumeric" {
    }
    "SQLCompliant" {
      $Characters += [char[]](33)     #!
      $Characters += [char[]](35..37) # #$%
    }
    default {
      $Characters += [char[]](33..47) # !"#&%'()*+,-./
    }
  }

  if($PSVersionTable.PSVersion.Major -eq 5) {
    $Password = @()
    For ($i = 0; $i -lt $Length; $i++) {
      $Password += $Characters | Get-Random
    }
  } else {
    $Password = @()
    For ($i = 0; $i -lt $Length; $i++) {
      $Password += $Characters[[System.Security.Cryptography.RandomNumberGenerator]::GetInt32($Characters.Count)]
    }
  }
  return -join $Password
}

Examples (when added to $PROFILE):

PS > get-randomString 20
SoAah#MwvY&B'M8GvFGI

PS > get-randomString 20 sqlCompliant
eO6sPxRAp789JZRAlelP

PS > 1..10 | % { Get-RandomString 20 SQLCompliant }
TTFoxZ87txhnbmIU9q5A
R4vWWvwgfP0qIt4XYu9o
s!f%CdUvlCI$zQrCFqSc
1TPCtleGZwHA0wesEGTg
eETPS96UevEjT6SQkKRP
vrPkAeR7Eb$3yN5zn42o
U#qpiEKi3CzdqM9EtHiG
pBmcscaeYIWl9I3BQqm!
xJu2c4vnef5MD1$XsgtE
$JbHI2i!eUTIlW9jlt4g

PS > $numb = 10; for ($i=1; $i -le $numb; $i++) { Get-RandomString 20 }
r6wNBT9Cj!qw9Xor!YME
#'#l&ElZtFCeJ")#%U.v
Mo4Y(Qf9w0$ZYcn25x6.
*C7m"ZXSEpuPSq53qbyu
8v2u+#*UM"OB27"5ykiP
cySi)CXY+Pyav!yx,t2J
HwmzRI%P0tFoz($TlH)W
#bkCV5VtYq4(xqNcwaax
w&mWb6Tga$+KGL(/"B)9
#UJPrdnot)$67umHIdGo

Update: Substituted Get-Random with RandomNumberGenerator::GetInt32() for a more Cryptographically Secure Pseudo-Random Number Generator (CSPRNG). This requires Powershell 7.x

Added a PowerShell version check (5.1 uses Get-Random) and fixed [char] ranges which didn't work in PS5.1.