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Difference between revisions of "Variables (PowerShell)"
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→Datetime: Turned into subsection of "Object Types" (new heading) and added "IP Address"
(→Macros / Built-in Variables: Added $env) |
(→Datetime: Turned into subsection of "Object Types" (new heading) and added "IP Address") |
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</source> | </source> | ||
== Datetime == | == Object Types == | ||
=== Datetime === | |||
The object structure: http://msdn.microsoft.com/en-us/library/system.datetime.aspx | The object structure: http://msdn.microsoft.com/en-us/library/system.datetime.aspx | ||
=== Improper (US) Formatting === | ==== Improper (US) Formatting ==== | ||
Be aware that if you live somewhere dates are normally formatted properly (eg not the USA), then PowerShell (or probably the underlying DateTime object type as this sort of problem seems to rear its head at unexpected moments when working on Windows) has a nasty habit of returning a string formatted with day and month swapped around when coming from a script. | Be aware that if you live somewhere dates are normally formatted properly (eg not the USA), then PowerShell (or probably the underlying DateTime object type as this sort of problem seems to rear its head at unexpected moments when working on Windows) has a nasty habit of returning a string formatted with day and month swapped around when coming from a script. | ||
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If your dates are getting mixed up, it may not be your mistake, and it may be that you've fallen fowl of the problem as well. | If your dates are getting mixed up, it may not be your mistake, and it may be that you've fallen fowl of the problem as well. | ||
=== Formatting === | ==== Formatting ==== | ||
To control how a DateTime is displayed you can pass it through <code> Get-Date </code> with the '''<code> -uFormat </code>''' option... | To control how a DateTime is displayed you can pass it through <code> Get-Date </code> with the '''<code> -uFormat </code>''' option... | ||
<source lang="powershell">Get-Date $datetime -uFormat "%R hrs, %a %d %b %Y"</source> | <source lang="powershell">Get-Date $datetime -uFormat "%R hrs, %a %d %b %Y"</source> | ||
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For the full list of formatting options see http://technet.microsoft.com/en-us/library/ee692801.aspx, and even more detail at http://msdn.microsoft.com/en-us/library/system.globalization.datetimeformatinfo.aspx | For the full list of formatting options see http://technet.microsoft.com/en-us/library/ee692801.aspx, and even more detail at http://msdn.microsoft.com/en-us/library/system.globalization.datetimeformatinfo.aspx | ||
=== Converters === | ==== Converters ==== | ||
<source lang="powershell"> | <source lang="powershell"> | ||
function ConvertLocalToUnix([datetime]$datetime) | function ConvertLocalToUnix([datetime]$datetime) | ||
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{ | { | ||
[timezone]::CurrentTimeZone.ToLocalTime(([datetime]'1/1/1970').AddSeconds($sincepoch)) | [timezone]::CurrentTimeZone.ToLocalTime(([datetime]'1/1/1970').AddSeconds($sincepoch)) | ||
} | |||
</source> | |||
=== IP Address === | |||
To create an IP address object... | |||
<source lang="powershell"> | |||
$ip = [System.Net.IPAddress]::Parse("192.168.1.123") | |||
</source> | |||
To confirm a supplied address is valid... | |||
<source lang="powershell"> | |||
if ([System.Net.IPAddress]::TryParse($IP-to-test) { | |||
Write-Host "$IP-to-test is a valid address" | |||
} | } | ||
</source> | </source> | ||