9-Conditional-Statements-in-Powershell.md

9. Conditional Statements in Powershell

If Conditional Statement

• If, elseif, else
• Supports usage of commands, cmdlets and pipeline in the condition part

PS C:\Users\Windows-32> if (1 -gt 0) {"One"} else {"Something"}
One
PS C:\Users\Windows-32> if (1 -gt 4) {"One"} else {"Something"}
Something
PS C:\Users\Windows-32>

PS C:\Users\Windows-32> if ( ((Get-Process).Count) -gt 40 ) {"Too many processes"} else {"OK"}
OK
PS C:\Users\Windows-32>

Switch Statement

• Supports parameters like (–Exact, –Wildcard, -Regex) for condition matching

PS C:\Users\Windows-32> switch (1) { 1 {"One"} 2 {"Two"} }
One
PS C:\Users\Windows-32> switch (11) { 1 {"One"} 2 {"Two"} default {"Default"} }
Default

PS C:\Users\Windows-32> switch -wildcard ('abc') { a* {"A"} *b* {"B"} c* {"C"} }
A
B
PS C:\Users\Windows-32>

PS C:\Users\Administrator> switch -Exact (111) { 1* {"Just one"} 2* {"Just two"} *1* {"All one"} 111 {"Exact all one"} }
Exact all one
PS C:\Users\Administrator>

• Ability to process files using the -file parameter

PS C:\Users\Windows-32> switch -Regex -File C:\test\WindowsUpdate.log { 'Validating'{$_} }