Introduction
We learned how to use variables, arrays and hashtables in Powershell basics part 1. We learned how to use arithmetic, assignment and comparison operators in Powershell basics part 2. Now we will check how we can use logical operators and redirection operators
Logical Operators
Following is the list of logical operators and their usage
Operator |
Description |
Usage |
| -and | Returns true when both left value and right value of operand are true |
The –and operator is similar to && operator in c#.
Ex: |
| -or | Returns true when either of the left value or right value of operand is true |
The –or operator is similar to || operator in c#.
Ex: |
| -xor | Returns true when only one is true in either of the right and left values of operand |
The –xor operator is similar to ^ operator in c#.
Ex: |
| ! or -not | This negates the resultant boolean value, true to false or false to true |
The ! operator is similar to ! operator in c#.
Ex: |
Redirection Operators
Following is the list of redirection operators and their usage
Operator |
Description |
Usage |
| > | Sends output to a file |
The following example will create new commandlog.txt file with the output of the cmdlet
Ex: |
| >> | Appends output to a file |
The following example will not create new commandlog.txt file everytime but appends the output of the cmdlet to the same txt file
Ex: |
| 2> | Sends errors to file |
The following example will create new commandlog.txt file with the errors that occured by the cmdlet. No errors will be displayed on the powershell console application
Ex: |
| 2>> | Appends errors to file |
The following example will create new commandlog.txt file with the errors that occured by the cmdlet but only appends to the existing file. No errors will be displayed on the powershell console application Ex: |
Conclusion
Hope you got some good understanding on the various operators in powershell and how they are used.
Any SharePoint / .net developer once understands the syntax and basic usage they can pile many advanced scripts 
We will further see how we can use flow controls (arrays, for loop, foreach…) and how to create functions.