PowerShell 現在處於什麼地位？有沒有必要學？

# Get full name of user
$username = [Environment]::UserName
$hostname = $env:COMPUTERNAME

# Am I an admin?
$wid = [System.Security.Principal.WindowsIdentity]::GetCurrent()
$prp = new-object System.Security.Principal.WindowsPrincipal($wid)
$adm = [System.Security.Principal.WindowsBuiltInRole]::Administrator
$IsAdmin = $prp.IsInRole($adm)

# Function to write git repository status on prompt
function writegitprompt($status){
if ($status) {
write-host " (" -nonewline
write-host ($status.Branch) -nonewline
write-host " " -nonewline
if($status.HasWorking) {
write-host "$([char]0x25CF)" -nonewline -ForegroundColor @{$true="Green";$false="DarkGray"}[$status.Working.Added -and $status.Working.Added.Count -ge 0]
write-host "$([char]0x25CF)" -nonewline -ForegroundColor @{$true=(@{$true="Red";$false="Yellow"}[$status.Working.Unmerged -and $status.Working.Unmerged.Count -ge 0]);$false=(@{$true="Red";$false="DarkGray"}[$status.Working.Unmerged -and $status.Working.Unmerged.Count -ge 0])}[$status.Working.Modified -and $status.Working.Modified.Count -ge 0]
write-host "$([char]0x25CF)" -nonewline -ForegroundColor @{$true="Red";$false="DarkGray"}[$status.Working.Deleted -and $status.Working.Deleted.Count -ge 0]
} else {
write-host "$([char]0x25CF)$([char]0x25CF)$([char]0x25CF)" -nonewline -ForegroundColor DarkGray
}
if($status.HasIndex) {
write-host "|" -nonewline
write-host "$([char]0x25CF)" -nonewline -ForegroundColor @{$true="Green";$false="DarkGray"}[$status.Index.Added -and $status.Index.Added.Count -ge 0]
write-host "$([char]0x25CF)" -nonewline -ForegroundColor @{$true=(@{$true="Red";$false="Yellow"}[$status.Index.Unmerged -and $status.Index.Unmerged.Count -ge 0]);false=(@{$true="Red";$false="DarkGray"}[$status.Working.Unmerged -and $status.Working.Unmerged.Count -ge 0])}[$status.Index.Modified -and $status.Index.Modified.Count -ge 0]
write-host "$([char]0x25CF)" -nonewline -ForegroundColor @{$true="Red";$false="DarkGray"}[$status.Index.Deleted -and $status.Index.Deleted.Count -ge 0]
}
write-host ")" -nonewline
}
}

# Here we go
function global:prompt {
$realLASTEXITCODE = $LASTEXITCODE
if($IsAdmin){
write-host $username -nonewline -ForegroundColor Red
} else {
write-host $username -nonewline -ForegroundColor Yellow
}
write-host " $([char]0x3C9) " -nonewline -ForegroundColor Gray
Write-Host($pwd.ProviderPath) -nonewline -ForegroundColor Green

writegitprompt (Get-GitStatus)

# Rightmost time display
# Save cursor position first
$saveY = [console]::CursorTop
$saveX = [console]::CursorLeft
$columns = (Get-Host).UI.RawUI.windowsize.width # Column quantity of console window
[console]::SetCursorPosition($columns - 8, $saveY)
write-host "[" -nonewline
write-host (Get-Date -format "HH:mm") -nonewline -ForegroundColor Cyan
write-host "]" -nonewline
[console]::setcursorposition($saveX,$saveY) # Move cursor back

# write information to the excel file
$i = 0
$first10 = (ps | sort ws -Descending | select -first 10)
$first10 | foreach -Process {$i++; $objWorksheet.Cells.Item($i,1) = $_.name; $objWorksheet.Cells.Item($i,2) = $_.ws}
$otherMem = (ps | measure ws -s).Sum - ($first10 | measure ws -s).Sum
$objWorksheet.Cells.Item(11,1) = "Others"; $objWorksheet.Cells.Item(11,2) = $otherMem