PowerShell 技能连载 - 管理已安装的模块（第 2 部分）

每当您通过 Install-Module 安装新模块或通过 Update-Module 更新现有模块时，新模块版本就会并行地安装。

如果您始终使用最新版本的模块，而无需访问特定的旧版本，则可能需要查找过时的模块并将其删除：

# get all installed modules as a hash table
# each key holds all versions of a given module
$list = Get-InstalledModule |
Get-InstalledModule -AllVersions |
Group-Object -Property Name -AsHashTable -AsString

# take all module names...
$list.Keys |
  ForEach-Object {
    # dump all present versions...
    $list[$_] |
    # sort by version descending (newest first)
    Sort-Object -Property Version -Descending |
    # and skip newest, returning all other
    Select-Object -Skip 1
} |
# remove outdated (check whether you really don't need them anymore)
Uninstall-Module -WhatIf