powershell脚本中的异常没有意义
powershell脚本中的异常没有意义
提问于 2019-12-28 14:35:31
我们在Windows2016服务器上有一个Server，它创建一个.MDF和日志文件的server备份，按计划在23:30工作日备份一次。我创建了一个内务脚本来开始删除这些.bak文件，这些文件都是两个工作日以上的。
然而，星期二的检查，功能异常。在下面的脚本中，AddDays(4)保留星期一、星期五和星期四的文件，而不仅仅是星期一和星期五的文件。但如果我将其更改为AddDays(3)，它只保留周一的文件。
为什么这是这样的行为？
# Determine day of week
$weekDay = (get-date).DayOfWeek.ToString()
$firstAbbrevCheck = $weekDay.SubString(0,3)
# write-host $firstAbbrevCheck
# Write date to log file to ensure sripts ran
$todaysDate = (get-date).ToString("ddMMyyyy")
Write-output $todaysDate | Out-file <path>\HouseKeepLog.txt -append
# If not a sunday or Monday then process
if($firstAbbrevCheck -ne "Sun") {
if($firstAbbrevCheck -ne "Mon") {
$secondAbbrevCheck = $weekDay.SubString(0,2)
# If retaining two work days of backups then for Tuesday delete
files greater than 4 days old
if($secondAbbrevCheck -eq "Tu") {
Get-ChildItem –Path <Path to backup folder> -recurse -Filter
*.bak -exclude master*, msdb* | Where-Object
{($_.LastWriteTime -lt (Get-Date).AddDays(-4))} | Remove-Item
}
else {
# Else Wed - Sat and delete files greater than 2 days old
Get-ChildItem –Path <Path to backup folder> -recurse -Filter
*.bak -exclude master*, msdb* | Where-Object
{($_.LastWriteTime -lt (Get-Date).AddDays(-2))} | Remove-Item
}
}
} 回答 2
Stack Overflow用户
回答已采纳
发布于 2019-12-28 16:24:17
您也可以使用UFormat。下面是操作步骤：
$today = Get-Date
$wd = Get-Date -UFormat "%A"
Write-output ('{0:ddMMyyyy}' -f $today >><path>\HouseKeepLog.txt
if (($wd -notmach "Su.*") -and ($wd -notmatch "Mo.*")) {
$rd = switch -Regex ($wd) {
"Tu.*" { $today.AddDays(-4).Date }
default { $today.AddDays(-2).Date }
}
Get-ChildItem "Path to backup folder" -Recurse -Filter "*.bak" -Exclude "master*", "msdb*" -File |
Where-Object {($_.LastWriteTime -lt $rd)} |
Remove-Item
}Stack Overflow用户
发布于 2019-12-28 15:19:39
"Tu“不是"Tue”顺便说一下，您可以将枚举与字符串进行比较：
(get-date).dayofweek -eq 'saturday'
True
'saturday' -eq (get-date).dayofweek
TrueFyi，下面是一周中的一天的布局：
(get-date).dayofweek.gettype()
IsPublic IsSerial Name BaseType
-------- -------- ---- --------
True True DayOfWeek System.Enum
0..6 | foreach { [system.dayofweek]$_ }
Sunday
Monday
Tuesday
Wednesday
Thursday
Friday
Saturday页面原文内容由Stack Overflow提供。腾讯云小微IT领域专用引擎提供翻译支持
原文链接：
https://stackoverflow.com/questions/59511831
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