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PS > "String" + 5String5
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It is also possible to add multiple string values to build up a single string This example uses the + operator to build up a URL from three strings:
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PS > "http://" + "SPServer01" + "/MySite" http://SPServer01/MySite
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PS > $url = "http://SPServer01" PS > $web = "MySite" PS > $url + "/" + $web http://SPServer01/MySite
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Description Adds two values Subtracts one value from another Multiplies two values Divides one value by another Returns the remainder from a division
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Table 6-1 Windows PowerShell Arithmetic Operators
6:
Operators
However, it is not possible to add a string to a numeric value
PS > 1 + ";#" + "Item" Cannot convert value "String" to type "SystemInt32" Error: "Input string was not in a correct format" At line:1 char:4 + 1 + <<<< "String" + CategoryInfo : NotSpecified: (:) [], RuntimeException + FullyQualifiedErrorId : RuntimeException
Windows PowerShell interprets the first argument as an instance of the type
SystemInt32 When we try to add a SystemString value to a SystemInt32 value, an error occurs Windows PowerShell expects an argument of the type System Int32, and it is not possible to convert a SystemString value containing characters
other than numeric ones The following is the correct way to add the values:
PS > "1" + ";#" + "Item" 1;#Item
You can also cast the numeric value using the [string] type literal, which is a PowerShell alias for the SystemString type
PS > [string]1 + ";#" + "Item" 1;#Item
The value on the left side defines the type of the whole operation You can add a number to a string, since a number can be converted to a string value, as shown in this example:
PS > "#Item" + 1 #Item1
Here are examples of using the other arithmetic operators: Use the operator to subtract numeric values:
PS > 5 - 4 1
The - operator also works with negative numbers:
PS > -1 - 1 -2
Use the * operator to multiply values:
PS > 5 * 5 25
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You can also multiply string values with a numeric value:
PS > "Hello" * 5 HelloHelloHelloHelloHello
Divide numeric values with the / operator:
PS > 9 / 3 3
Use the modulus (%) operator to calculate remainders:
PS > 10 % 3 1 PS > 6 % 2 0
Assignment Operators
Assignment operators are used to assign one or more values to a variable, modify values in a variable, or add values to a variable Table 6-2 shows the assignment operators available in Windows PowerShell
Operator
= += = *= /= %= ++
Description Sets the value of a variable to the specified value Increases the value of a variable by the specified value or appends to the existing value Decreases the value of a variable by the specified value Multiplies the value of a variable by the specified value or appends the specified value to the existing value Divides the value of a variable by the specified value Divides the value of a variable by the specified value and assigns the remainder to the variable Increases the value by one Decreases the value by one
Table 6-2 Windows PowerShell Assignment Operators
6:
Operators
The most common assignment operator is the equal operator (=) You can use the equal operator to assign a value to a variable
PS > $variable = 1 PS > $variable 1
You can also assign the same value to multiple variables
PS > $variable1 = $variable2 = 3 PS > $variable1 3 PS > $variable2 3
Here are examples of using some of the other assignment operators: To increase the value of a variable by a specific value, use the += operator:
PS > $variable = "Windows" PS > $variable += " " PS > $variable += "PowerShell" PS > $variable Windows PowerShell
To decrease a variable with a specific value, use the -= operator:
PS > $variable = 5 PS > $variable -= 3 PS > $variable 2
To multiply a variable with a specific value, use the *= operator:
PS > $variable = "-" PS > $variable *= 8 PS > $variable --------
To increase a numeric value by one, use the ++ operator:
PS > $variable = 1 PS > $variable ++ PS > $variable 2
To decrease a numeric value by one, use the -- operator:
PS > $variable = 0 PS > $variable -PS > $variable -1
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Comparison Operators
The comparison operators are used to compare values, as well as to find values that match specific patterns Table 6-3 lists the comparison operators available in Windows PowerShell The -eq operator returns True or an array of matching values if it can match the value on the right with one or more values on the left The operator returns True if an exact match is made
PS > "http://SPServer01" -eq "http://SPServer01" True PS > "http://SPServer01" -eq "http://SPServer01/Site" False
In the first example, we use the eq operator to compare two identical strings In the second example, we add a few lines to the value on the right Since the strings are not identical, False is returned We can also use the eq operator to match an argument on the right side with an array of values on the left
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