[Sham]

тестируйте

Код:

get-childitem $PSScriptRoot -Directory | % {
  $dir = $_; $count = 0;
  $dir | get-childitem -File | % {
    if ($_.Name -match '^(k\d+_)(\d+)(\.png)$') {
      [pscustomobject]@{ N = [int]$matches[2]; M = $matches; O = $_; }
    }
  } | sort-object 'N' | % { ++$count;
    while (test-path ($newpath = join-path $dir.fullname ($name = $_.M[1] + $count + $_.M[3]))) {
      if ($_.O.fullname -eq $newpath) { return }
        ++$count;
      }
    'rename: {0} -> {1}' -f $_.O.fullname, $name
    $_.O.MoveTo($newpath);
  }
}