将厨房水槽扔到 PowerShell 上

有一天，我观看了 Shane Young 的一段关于 PowerShell 配置文件入门的精彩介绍视频。我广泛使用配置文件脚本，它们在配置 PowerShell 体验时非常有用。您可以添加到您的个人资料中的一项元素是自定义的 PowerShell 提示符。 Microsoft 默认提供了一个。它创建了一个称为提示的简单函数。最好的部分是您可以定义自己的函数，称为提示，PowerShell 将在您每次按 Enter 时运行它。

例如，您可能希望提示符也显示 PowerShell 版本。

Function prompt {

"[$(($psversiontable.psversion).tostring())]PS $($executionContext.SessionState.Path.CurrentLocation)$('>' * ($nestedPromptLevel + 1)) ";

}

您可以继续并将其粘贴到您的 PowerShell 会话中。如果你想看到结果。下次打开 PowerShell 时，您将恢复原来的提示。作为 PowerShell 极端主义者，我自然而然地回去更新了我的“厨房水槽”提示功能。也就是说，我可以在提示中塞入多少内容？这个怎么样：

我用标注注释了一些关键功能。系统信息周围的框轮廓根据可用物理内存量进行颜色编码。 70% 或更好时为绿色，30% 时变为黄色，否则变为红色。

EverythingPrompt.ps1:

The border around the system information will be color coded depending on the percentage
of free physical memory. The value before the date and time is the computer uptime.

The first value in the prompt will be the history ID number. The number in brackets is
the PowerShell version.

The window title will show the run time of your PowerShell session, the computername,
whether you are running as Administrator and the current location.
#>

if ($IsWindows -OR $PSEdition -eq 'Desktop') {


    Function Test-IsAdministrator {  
        $user = [Security.Principal.WindowsIdentity]::GetCurrent();
        (New-Object Security.Principal.WindowsPrincipal $user).IsInRole([Security.Principal.WindowsBuiltinRole]::Administrator)  
    }

    Function Test-IsPS32 {
        $psfilename = (Get-Process -id $pid).mainmodule.filename
        if ($psfilename -match "SysWoW64") {
            $True
        }
        else {
            $False
        }
    }

    Function prompt {

        #add global variable if it doesn't already exist
        if (-Not $global:LastCheck) {
            $global:LastCheck = Get-Date
            $global:cdrive = Get-CimInstance -query "Select Freespace,Size from win32_logicaldisk where deviceid='c:'"
        }

        #only refresh disk information once every 15 minutes
        $min = (New-TimeSpan $Global:lastCheck).TotalMinutes
        if ($min -ge 15) {
            $global:cdrive = Get-CimInstance -query "Select Freespace,Size from win32_logicaldisk where deviceid='c:'"
            $global:LastCheck = Get-Date
        }
        $diskinfo = "{0:N2}" -f (($global:cdrive.freespace / 1gb) / ($global:cdrive.size / 1gb) * 100)

        #only the get the CIM properties we need to cut down on processing time
        $cpu = (Get-CimInstance -ClassName win32_processor -property loadpercentage).loadpercentage
        #get the number of running processes
        $pcount = (Get-Process).Count

        $os = Get-CimInstance -class Win32_OperatingSystem -Property LastBootUpTime, TotalVisibleMemorySize, FreePhysicalMemory
        #calculate the percentage of free physical memory
        $freeMem = $os.freephysicalmemory / 1mb
        #get uptime
        $time = $os.LastBootUpTime
        [TimeSpan]$uptime = New-TimeSpan $time $(get-date)
        #construct an uptime string e.g. 13d 15h 18m 38s
        $up = "$($uptime.days)d $($uptime.hours)h $($uptime.minutes)m $($uptime.seconds)s"

        #this is the text to appear in the status box
        $text = "CPU:{0}% FreeMem:{6:n2}GB Procs:{1} Free C:{2}% {3}{4} {5}" -f $cpu.ToString().padleft(2, "0"), $pcount, $diskinfo, ([char]0x25b2), $up, (Get-Date -format G), $FreeMem

        #display prompt data in color based on the amount of free memory
        $pctFreeMem = $os.FreePhysicalMemory / $os.TotalVisibleMemorySize
        if ($pctFreeMem -ge .70) {
            $color = "green"
        }
        elseif ($pctFreeMem -ge .30) {
            $color = "yellow"
        }
        else {
            $color = "red"
        }

        #write the status box with an appropriate outline color
        Write-Host $([char]0x250c) -NoNewline -ForegroundColor $color
        Write-Host $(([char]0x2500).ToString() * $text.length ) -ForegroundColor $color -NoNewline
        Write-Host $([char]0x2510) -ForegroundColor $color
        Write-Host $([char]0x2502) -ForegroundColor $color -NoNewline
        Write-Host $text -NoNewline
        Write-Host $([char]0x2502) -ForegroundColor $color
        Write-Host $([char]0x2514) -ForegroundColor $color -NoNewline
        Write-Host $(([char]0x2500).ToString() * $text.length) -NoNewline -ForegroundColor $color
        Write-Host $([char]0x2518) -ForegroundColor $color

        #get history ID
        $hid = (Get-History -count 1).id + 1

        #test if running 32 bit version of PowerShell
        if (Test-IsPS32) {
            $PsArch = "(x86)"
        }
        else {
            $PSArch = $null
        }

        #write a prompt to the host
        Write-Host "$hid [v$($psversiontable.psversion)]PS$PSArch$('>' * ($nestedPromptLevel + 1))" -nonewline

        #set the PowerShell session time, computername and current location in the title bar

        #get start time for the current PowerShell session
        #$pid is a special variable for the current PowerShell process ID
        [datetime]$psStart = (get-Process -id $pid).StartTime
    
        $ts = (Get-Date) - $psStart
        #strip off the millisecond part with Substring().  The
        #millisecond part will come after the last period
        $s = $ts.ToString()
        $elapsed = $s.Substring(0, $s.LastIndexOf(".")) 

        #test if running in an elevated session
        if (Test-IsAdministrator) {
            $As = "Administrator"
        }
        else {
            #show the current user
            $as = "$($env:USERDOMAIN)$($env:username)"
        }

        #get the current location including if in a nested level
        $loc = "$($executionContext.SessionState.Path.CurrentLocation)$('>' * ($nestedPromptLevel + 1))"

        #set the window title
        $title = "[{0}{1}{2} as {3}]  {4}" -f $elapsed, ([char]0x25ba), $env:computername, $as, $loc
        $host.ui.rawui.WindowTitle = $title

        #the function's actual output is nothing
        return " "

    } #close prompt function

}
else {
    throw "The functions in this script require a Windows platform."
}

如果你想解决这个问题，Github 上有提示函数和一些辅助函数。

要使其成为您的配置文件的一部分，请打开您的配置文件脚本并点源脚本文件。

更多地将其视为概念证明或“借用”的东西。如果您的 PowerShell 提示符中有一些很酷或有趣的内容，我很想听听。