Home windows PowerShell scripts are written with a selected job or set of duties in thoughts. Nonetheless, relying on a number of standards, an operation might have multiple conceivable motion. The PowerShell If Else assemble can be utilized on this state of affairs.
You may embody conditional logic statements in your PowerShell applications utilizing if statements. If statements signify how individuals make choices each day. When a situation is happy, one thing happens. As an example, in case you are operating late for work, you’ll take a cab to get there on time.
Just like if statements in different programming languages, if statements in PowerShell have the identical impact.
Understanding the PowerShell If Syntax
On this graphic, if the situation is met, a sure command or assertion is executed. The next command or assertion is executed if the situation is fake. Right here is a simple PowerShell script.
On this occasion, a variable referred to as $BANANAS was created and given the worth 8. The following step is to set a conditional assertion that states to show a message if $BANANAS is lower than 12. The message “You will have lower than a dozen BANANAS” is proven since $BANANAS has a price of 8.
After studying the basics of if statements, let’s delve slightly additional and focus on the syntax and a few extra complicated situations.
$BANANAS = 8
if ($BANANAS -lt 12) {
"You will have lower than a dozen BANANAS."
}
Methods To Use PowerShell if-else Assertion
- Utilizing the PowerShell If-Else Assertion (Single If-Else Situation)
- A number of If-Else Situations with ElseIf Assertion
- Utilizing conditional statements with an If Else Assertion
1. Utilizing the PowerShell If-Else Assertion (Single If-Else Situation)
If statements are regularly adopted by an Else assertion. If the situation will not be happy or the result’s false, you possibly can take an extra motion utilizing an in any other case assertion.
It’s clear that there are actually two statements that may be carried out. If the situation returns true, one assertion, and if it doesn’t, one assertion. Right here is a simple If-Else assertion instance in PowerShell. As you possibly can discover the situation is in parenthesis and the entire if-else operator is in curly brackets.
$a = 9
if ($a -gt 3) {
"$a is bigger than 3"
}
else {
"$a is lower than 3"
}On this occasion, the variable $a has been assigned to the quantity 9. Then, we set the situation in our If assertion to show the message “$a is bigger than 3” if $a is bigger than 3. Final however not least, we set our Else assertion to indicate the warning “$a is lower than 3” if the situation is fake.
The screenshot exhibits that as a result of $a equaled 9, the situation was happy.
Let’s now set $a to 2, which can trigger the situation to return false. On condition that the situation now returns false, you possibly can see that PowerShell is returning our Else situation, “$a is lower than 3.”
$a = 2
if ($a -gt 3) {
write-host "$a is bigger than 3"
}
else {
write-host "$a is lower than 3"
}
2. A number of If-Else Situations with ElseIf Assertion
You should embody a number of ElseIf strains when evaluating a number of circumstances. The check expression and the related code are contained in every ElseIf assertion.
When the script beneath is run, it would repeatedly asking for the identify of a fruit till the person varieties the letter “A” or presses CTRL+C.
Whereas ($fruit -ne "A") {
$fruit = Learn-Host "Title Your fruit"
if ($fruit -eq 'Apple') {
'I've an Apple'
}
elseif ($fruit -eq 'Banana') {
'I've a Banana'
}
elseif ($fruit -eq 'Orange') {
'I've an Orange'
}
else {
'Sorry, fruit will not be within the database'
}
}The If clause will then iterate by every situation in flip till it discovers a match. The Else assertion’s perform would run if the enter didn’t fulfill any of the circumstances.
Right here is an instance of how the script from above features when run in PowerShell.
3. Utilizing conditional statements with an If Else Assertion
If and Else statements could be nested inside different If and Else statements utilizing PowerShell. Nested conditional statements primarily repeat the assertion till both one is returned true or all are returned false. Conditional statements could be nested in a couple of other ways. The addition of a brand new If-Else assertion simply inside an If or Else script block is one strategy.
if (condition1) {
"condition1 is true"
}
else {
if (situation 2) {
"situation 2 is true"
}
else {
"situation 2 is fake"
}
}Using the elseif assertion is the second and beneficial methodology of nesting conditional statements. This instance expands on the previous Banana instance.
$BANANAS = 14
if ($BANANAS -eq 12) {
"You will have precisely a dozen BANANAS."
}
elseif ($BANANAS -lt 12) {
"You will have lower than a dozen BANANAS."
}
else {
"You will have greater than a dozen BANANAS."
}
Three outcomes are potential on this case. If there are exactly 12 Bananas, one. If there are fewer than 12 Bananas, one. Furthermore, if there are greater than 12 Bananas, one.
You may see that we set the $Bananasvariable to 14 within the screenshot above, which brought about the Else assertion to return with the message “You will have greater than a dozen Bananas.”
