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How to remove old Docker containers

... Updated Answer Use docker system prune or docker container prune now. See VonC's updated answer. Previous Answer Composing several different hints above, the most elegant way to remove all non-running containers seems to be: docker rm $(docker ps -q -f status=exited) -q prints just the...
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How efficient is locking an unlocked mutex? What is the cost of a mutex?

... itself manages the scheduling and context switches, this makes sense. But now I have a rough imagination about what the mutex lock/unlock will do internally. – Albert Sep 6 '10 at 21:55 ...
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What to do with commit made in a detached head

... I know this is years later, but thanks for this answer. I didn't consider myself done searching with the accepted answer here because I didn't want to leave around a temporary branch and this answer has the command to delete it....
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Where is the itoa function in Linux?

...intf(target_string, size_of_target_string_in_bytes, "%d", source_int). I know it's not quite as concise or cool as itoa(), but at least you can Write Once, Run Everywhere (tm) ;-) Here's the old (edited) answer You are correct in stating that the default gcc libc does not include itoa(), like sev...
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How do I convert a dictionary to a JSON String in C#?

...rt my Dictionary<int,List<int>> to JSON string. Does anyone know how to achieve this in C#? 13 Answers ...
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How to delete history of last 10 commands in shell?

...06, then 1007 becomes 1006 and 1006 is deleted, then 1008 (became 1007) is now 1006 and gets deleted. If I also wanted to delete the history delete command then it's a bit more complicated because you need to know the current max history entry. You can get this with (there may be a better way): ...
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How do I print debug messages in the Google Chrome JavaScript Console?

...like if (!window.console) { and then put everything inside brackets? Right now you're evaluating the same stuff four times. – Dan Rosenstark Sep 19 '11 at 16:33 ...
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How to open an elevated cmd using command line for Windows?

...%cd%\" -Verb RunAs" Move sudo.bat to a folder in your PATH; if you don't know what that means, just move these files to c:\windows\ Now sudo will work in Run dialog (win+r) or in explorer address bar (this is the best part :)) Method 2: WITH a 3rd party program Download NirCmd and unzip it. Cre...
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How to map and remove nil values in Ruby

... Ruby 2.7+ There is now! Ruby 2.7 is introducing filter_map for this exact purpose. It's idiomatic and performant, and I'd expect it to become the norm very soon. For example: numbers = [1, 2, 5, 8, 10, 13] enum.filter_map { |i| i * 2 if i.ev...
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Get the size of the screen, current web page and browser window

... This has everything you need to know: Get viewport/window size but in short: var win = window, doc = document, docElem = doc.documentElement, body = doc.getElementsByTagName('body')[0], x = win.innerWidth || docElem.clientWidth || body.clie...