powershell – 如果/ ElseIf阻止不使用-or

Question

我正在为我儿子写的剧本有问题.我的意图是提醒他记住他的家务.我刚刚开始做Power Shell,我真的非常喜欢它.我已经买了几本书,还经历了很多其他的帖子.

到目前为止我所得到的是,似乎评估与-or无法正常工作(或者我可能会这么做？)

## REMINDERS TO DO CHORES ##

$sun = "Sunday"
$mon = "Monday"
$tue = "Tuesday"
$wed = "Wednesday"
$thu = "Thursday"
$fri = "Friday"
$sat = "Saturday"

$today = (get-datE).DayOfWeek

$choreVac = "VACUUM the rooms and stairs"
$choreBath = "Clean the Bathroom Including emptying the garbage"
$choreOther = "No Chores Today -- But keep dishes done up"


if($today -eq $mon -or $wed -or $fri) {
msg /time:2500 * "Today is a Chore Day:  your job is to $choreVac" 
}

elseif ($today -eq $tue -or $sat ) {
msg /time:2500 * "Today is a Chore Day: your job is to $choreBath and PLEASE do a good job"
}
else {
msg /time:2500 * $choreOther
}@H_450_24@ 
 问题是我不认为它在当天被正确评估,所以今天是星期二,评估结果是$mon -or $wed -or $fri 
 如果我按照以下方式对每天进行重新编码,那就像预期的那样工作.为什么不使用-or？ 
  
 
if($today -eq $tuE) {
msg /time:2500 * $choreBath
}@H_450_24@

Answer 1

就像你发现自己一样,PowerSHell没有评估你的if语句你的预期.你的表达可以更好地理解为：

if(($today -eq $mon) -or ($wed) -or ($fri))@H_450_24@

就像在你的评论中一样,你想要的代码是

$today -eq $mon -or $today -eq $wed -or $today -eq $fri@H_450_24@

或另一种看待它的方式.

($today -eq $mon) -or ($today -eq $wed) -or ($today -eq $fri)@H_450_24@

PowerSHell不需要括号,但如果事情不顺利,最好使用它们.

当转换为布尔值时,PowerSHell中的非null /零长度字符串为true.专注于第二个条款,它可以改写为

"Wednesday" -or "Friday"@H_450_24@

这总是如此.这就是为什么你的if语句在你不期望的时候被触发的原因.

你编码的内容有一定的逻辑意义,但它在语法上是不正确的.我想向你介绍的另一种方法,如果你还不熟悉它,那就是switch.它将有助于减少所有if语句的混乱,如果随着时间的推移它们变得越来越复杂,它们将特别有用.

$today = (get-datE).DayOfWeek

$choreVac = "VACUUM The Apt"
$choreBath = "Clean the Bathroom Including empTing the garbage"
$choreOther = "NO CHORES TODAY -- BUT YOU CAN Keep dishes done up,and Keep Garbage from Overflowing AND CLEAN YOUR ROOM and OR Do Laundry!!!. Especially your bedding"

Switch ($today){
    {$_ -in 1,3,5}{$message = "Today is a Chore Day:  Your job is to`r$choreVac"}
    {$_ -in 2,6}{$message = "Today is a Chore Day:  Your job is to`r$choreBath and PLEASE do a good job"}
    default{$message = $choreOther}
}

msg /time:2500 * $message@H_450_24@ 
 我们将所有对msg的调用删除为一个语句,因为只有$message更改.如果一个苦差日没有被交换机中的条款覆盖,那么默认值只是$choreOther. 
 一周中的日子也可以表示为整数,就像你在上面看到的那样.这可能会降低代码的可读性,但我认为这是一个延伸.

powershell – 如果/ ElseIf阻止不使用-or

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