修改了所有 PowerShell 提示符

由于现在是星期五，是时候享受更多 PowerShell 乐趣了，而且我一直在分享我的一些提示功能，所以我想我应该重新分享我的厨房水槽提示。此 PowerShell 提示功能可以做“很多”事情，并在每次按 Enter 时为您提供系统的快照视图。它将跨平台工作，但由于该函数使用 Get-CimInstance 来检索它需要 Windows 的系统信息。提示功能不仅可以自定义屏幕提示，还可以自定义标题栏。

因为这是一个非常极端的提示，所以有一点开销。尽管有代码可以缓存一些每 15 分钟更新一次的信息。

您可以从 Github 获取代码。

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."
}

享受！