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82 lines
2.0 KiB
Markdown
82 lines
2.0 KiB
Markdown
## The *check-subnet-mask.ps1* Script
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This PowerShell script checks the given subnet mask for validity.
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## Parameters
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```powershell
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check-subnet-mask.ps1 [[-address] <String>] [<CommonParameters>]
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-address <String>
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Specifies the subnet mask to check
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Required? false
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Position? 1
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Default value
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Accept pipeline input? false
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Accept wildcard characters? false
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[<CommonParameters>]
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This script supports the common parameters: Verbose, Debug, ErrorAction, ErrorVariable, WarningAction,
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WarningVariable, OutBuffer, PipelineVariable, and OutVariable.
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```
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## Example
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```powershell
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PS> ./check-subnet-mask 255.255.255.0
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✔️ subnet mask 255.255.255.0 is valid
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```
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## Notes
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Author: Markus Fleschutz | License: CC0
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## Related Links
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https://github.com/fleschutz/PowerShell
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## Source Code
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```powershell
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<#
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.SYNOPSIS
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Checks the given subnet mask for validity
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.DESCRIPTION
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This PowerShell script checks the given subnet mask for validity.
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.PARAMETER address
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Specifies the subnet mask to check
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.EXAMPLE
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PS> ./check-subnet-mask 255.255.255.0
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✔️ subnet mask 255.255.255.0 is valid
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.LINK
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https://github.com/fleschutz/PowerShell
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.NOTES
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Author: Markus Fleschutz | License: CC0
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#>
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param([string]$address = "")
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function IsSubNetMaskValid { param([string]$IP)
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$RegEx = "^(254|252|248|240|224|192|128).0.0.0$|^255.(254|252|248|240|224|192|128|0).0.0$|^255.255.(254|252|248|240|224|192|128|0).0$|^255.255.255.(255|254|252|248|240|224|192|128|0)$"
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if ($IP -match $RegEx) {
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return $true
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} else {
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return $false
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}
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}
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try {
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if ($address -eq "" ) { $address = read-host "Enter subnet mask to validate" }
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if (IsSubNetMaskValid $address) {
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"✔️ subnet mask $Address is valid"
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exit 0 # success
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} else {
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write-warning "Invalid subnet mask: $address"
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exit 1
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}
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} catch {
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"⚠️ Error in line $($_.InvocationInfo.ScriptLineNumber): $($Error[0])"
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exit 1
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}
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```
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*Generated by convert-ps2md.ps1 using the comment-based help of check-subnet-mask.ps1*
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