Best Practice: You should use the #Requires statement in your scripts or modules (recommended at the top of the script).
Explanation:
The #Requires statement will run a script only if the prerequisites are met.
For example, if you created a script using classes (available in PowerShell 5), older PowerShell versions will not be able to run it.
PowerShell version : #Requires -Version 5.0
===
Module : #Requires -Modules activedirectory
===
RunAsAdministrator: #Requires -RunAsAdministrator
You can have several requirements in the same line: #Requires -Version 3.0 -Modules ActiveDirectory, DnsClient -RunAsAdministrator
or in several lines (I prefer having that in several lines, it is clearer to read).
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#Requires -Version 3.0 #Requires -Modules ActiveDirectory, DnsClient #Requires -RunAsAdministrator |
There is no specific order and you can put the #Requires statement where you want (here in line 2).
It is case insensitive (#REQUIRES #Requires or #requires, all work).
It is much better to use #Requires statement instead of writing additional code (to check specific version, module, etc.) or custom messages (moreover the error will be in the local language of the user).
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# Recommended #Requires -Version 5.0 # Not recommended if ($PSVersionTable.PSVersion.Major -lt 5) { Write-Warning -Message "At least PowerShell 5 is required to run this script" return } |
Here’s a test for you… make a simple script containing nothing but the following…
param(
[switch]$test1 = $false,
[switch]$test2 = $false
)
Save it, run it, and test the tab autocompletion for the parameters…. – works fine right?
Now, add this 1 extra line at the end:
#requires -modules activedirectory
again, save & run and test autocompletion of the params… – notice anything different?
I have tried this on 3 different machines, one’s got PoSh 2.0, the others both 5.1
On all 3, if the module specified is activedirectory, the tab autocomplete stops working for the params… – other modules (that I’ve tried, such as msonline, azuread etc.) do NOT appear to break it… thus far the only module I’ve found that does is the aforementioned activedirectory…
It happens in both the console and the ISE (not tested any other IDE’s).
Weird….? A bug…? Thoughts….?