如何正确检查进程是否正在运行并停止它

确定进程(例如 FireFox)是否正在运行并停止它的正确方法是什么？

我四处看了看，发现最好的办法是这样的:

if((get-process "firefox" -ea SilentlyContinue) -eq $Null){
echo "Not Running"
}


else{
echo "Running"
Stop-Process -processname "firefox"
}

这是理想的做法吗? 如果不是，正确的做法是什么？

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最佳答案

你这样做的方式是你两次查询进程。林恩还提出了一个很好的观点，那就是首先要友善。我可能会尝试以下方法:

# get Firefox process
$firefox = Get-Process firefox -ErrorAction SilentlyContinue
if ($firefox) {
# try gracefully first
$firefox.CloseMainWindow()
# kill after five seconds
Sleep 5
if (!$firefox.HasExited) {
$firefox | Stop-Process -Force
}
}
Remove-Variable firefox
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If you don't need to display exact result "running" / "not runnuning", you could simply:

ps notepad -ErrorAction SilentlyContinue | kill -PassThru

If the process was not running, you'll get no results. If it was running, you'll receive get-process output, and the process will be stopped.

小开

Thanks @Joey. It's what I am looking for.

I just bring some improvements:

  • to take into account multiple processes
  • to avoid reaching the timeout when all processes have terminated
  • to package the whole in a function
function Stop-Processes {
param(
[parameter(Mandatory=$true)] $processName,
$timeout = 5
)
$processList = Get-Process $processName -ErrorAction SilentlyContinue
if ($processList) {
# Try gracefully first
$processList.CloseMainWindow() | Out-Null


# Wait until all processes have terminated or until timeout
for ($i = 0 ; $i -le $timeout; $i ++){
$AllHaveExited = $True
$processList | % {
$process = $_
If (!$process.HasExited){
$AllHaveExited = $False
}
}
If ($AllHaveExited){
Return
}
sleep 1
}
# Else: kill
$processList | Stop-Process -Force
}
}
小开

@jmp242 - the generic System.Object type does not contain the CloseMainWindow method, but statically casting the System.Diagnostics.Process type when collecting the ProcessList variable works for me. Updated code (from this answer) with this casting (and looping changed to use ForEach-Object) is below.

function Stop-Processes {
param(
[parameter(Mandatory=$true)] $processName,
$timeout = 5
)
[System.Diagnostics.Process[]]$processList = Get-Process $processName -ErrorAction SilentlyContinue


ForEach ($Process in $processList) {
# Try gracefully first
$Process.CloseMainWindow() | Out-Null
}


# Check the 'HasExited' property for each process
for ($i = 0 ; $i -le $timeout; $i++) {
$AllHaveExited = $True
$processList | ForEach-Object {
If (-NOT $_.HasExited) {
$AllHaveExited = $False
}
}
If ($AllHaveExited -eq $true){
Return
}
Start-Sleep 1
}
# If graceful close has failed, loop through 'Stop-Process'
$processList | ForEach-Object {
If (Get-Process -ID $_.ID -ErrorAction SilentlyContinue) {
Stop-Process -Id $_.ID -Force -Verbose
}
}
}
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To start with process-killing, here python, my 2 cents:

Get-Process python3.9|Stop-Process

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