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Run cron job only if it isn't already running
...w you don't have to write the code yourself. Check out more reasons here: https://serverfault.com/a/82863
/usr/bin/flock -n /tmp/my.lockfile /usr/local/bin/my_script
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Filtering for empty or NULL names in a queryset
...ch as CharField or TextField. Read the documentation for the explanation:
https://docs.djangoproject.com/en/dev/ref/models/fields/#null
Solution:
You can also chain together methods on QuerySets, I think. Try this:
Name.objects.exclude(alias__isnull=True).exclude(alias="")
That should give you ...
How to tell git to use the correct identity (name and email) for a given project?
...ss/"]
path = ~/.gitconfig.github # user.name and user.email for GitHub
https://motowilliams.com/conditional-includes-for-git-config#disqus_thread
To use Git 2.13 you will either need to add a PPA (Ubuntu older than 18.04/Debian) or download the binaries and install (Windows/other Linux).
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Unzip files programmatically in .net
...how simple the setup was. It worked on first try, no errors, no nothing.
https://github.com/jaime-olivares/zipstorer
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Which browsers support ?
...track of which browsers support async (and defer) in the MDN website here:
https://developer.mozilla.org/en-US/docs/HTML/Element/script
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How to document Ruby code?
...that YARD is still not included in Ruby. (By the way YARD homepage accepts HTTPS.)
– Franklin Yu
Oct 25 '17 at 15:30
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Collisions when generating UUIDs in JavaScript?
...ogle-chrome-math-random-issue.html
(Link broken as of 2019. Archive link: https://web.archive.org/web/20190121220947/http://devoluk.com/google-chrome-math-random-issue.html.)
Seems like collisions only happen on the first few calls of Math.random. Cause if you just run the createGUID / testGUIDs m...
jQuery event for images loaded
... the canonical plugin for detecting image load complete events is now at:
https://github.com/desandro/imagesloaded
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Viewing contents of a .jar file
... work on bash/zsh and similars, or emacs' eshell.
Additional information: https://docs.oracle.com/javase/tutorial/deployment/jar/view.html
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Free space in a CMD shell
... 98G 14G 84G 15% /cygdrive/r
Cygwin is available for free from: https://www.cygwin.com/
It adds many powerful tools to the command prompt. To get just the available space on drive M (as mapped in windows to a shared drive), one could enter in:
M:\>df -h | grep M: | awk '{print $4}'
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