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How to make sure only one instance of a bash?
A solution that does not require additional tools would be prefered. Almost like nsg’s answer: use a lock directory. Directory creation is atomic under linux and unix and *BSD and a lot of other OSes.
How to ensure only one instance of a given script is running?
Closed 3 years ago. What is the simplest/best way to ensure only one instance of a given script is running – assuming it’s Bash on Linux? it doesn’t let me run the same script from separate accounts – which I would like sometimes. Of course, I can write my own pidfile handling, but I sense that there should be a simple way to do it.
When to use an exit trap in Bash?
There is another situation where the exit trap is very useful: if your script initiates an expensive resource, needed only while the script is executing, and you want to make certain it releases that resource once it’s done. For example, suppose you are working with Amazon Web Services (AWS), and want a script that creates a new image.
How to invoke Bash, run commands inside the new shell?
The user’s rc file is read first, then a command ls -la is sent for execution to the new shell before it turns interactive. The last echo adds an extra newline that is needed to finish execution.
How can I ensure only one instance of a script is running?
Suppose I launch a powershell script and it’s running in a loop. I open a second ps console and launch a second script. In this script I want to detect if the first script is running or not. What are the ways to achieve this?
How to make sure only one instance of Python is running?
Other alternatives could be combining this with flock or posix semaphores. Opening a network socket, as saua proposed, would probably be the easiest and most portable. For anybody using wxPython for their application, you can use the function wx.SingleInstanceChecker documented here.
How to run wxPython with only one instance?
For anybody using wxPython for their application, you can use the function wx.SingleInstanceChecker documented here. I personally use a subclass of wx.App which makes use of wx.SingleInstanceChecker and returns False from OnInit () if there is an existing instance of the app already executing like so: