$today=Get-Date

#"今天是：$today"

#昨天

#"昨天是:$($today.AddDays(-1))"

#明天

#"明天是:$($today.AddDays(1))"

#一周前

#"一周前是: $($today.AddDays(-7))"

#五个月前

#"五个月前:$($today.AddMonths(-5))"

#十年之前

#"十年之前:$($today.AddYears(-10).Year)年,我们是朋友."

#日期格式化

#"格式化日期：" + $today.ToString('yyyy-MM-dd')

$7day=$($today.AddDays(-7).ToString('yyyy-MM-dd'))

#$7day

$localdbdir="D:\database_bak"

$remotedbdir="D:\master_database_bak"

$downonlinefiledir="D:\db_online_bak"

#删除7天前的文件

function delfiles

{

    #布尔类型转换成整数

    $result=Test-Path $_.FullName |foreach { [int] $_ }

    if ($result -eq 1) {

        del $_.FullName

        "删除文件成功！"

        }

    else{

        "文件不存在"

        break

        }

}

#Test-Path $downwebfiles

function delfile

{

    if($args.Count -eq 0)

    {

        "No argument!"

    }

    else

    {   

        $args | foreach { delfiles "$($_)"}

    }

}

function delfilelist

{

    #$args

    if($args.Count -eq 0)

    {

        "No argument!"

    }

    elseif($args -eq $downonlinefiledir)

    {

    Get-ChildItem -Path $args  -Recurse -ErrorAction SilentlyContinue -Filter *.rar |Where-Object { $_.Extension -eq '.rar' }|`Where-Object -FilterScript {($_.LastWriteTime -lt $7day) -and ` ($_.PsISContainer -ne $True)} |

    Select-Object FullName|

    ForEach-Object {delfiles $_.FullName}

    }

    else

    {

    Get-ChildItem -Path $args  -Recurse -ErrorAction SilentlyContinue -Filter *.bak |Where-Object { $_.Extension -eq '.bak' }|`Where-Object -FilterScript {($_.LastWriteTime -lt $7day) -and ` ($_.PsISContainer -ne $True)} |

    Select-Object FullName|

    ForEach-Object {delfiles $_.FullName}

    }

}

delfilelist $localdbdir

delfilelist $remotedbdir

delfilelist $downonlinefiledir