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How would I get a cron job to run every 30 minutes?

...to add a crontab entry to execute a script every 30 minutes, on the hour and 30 minutes past the hour or something close. I have the following, but it doesn't seem to run on 0. ...
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How to best position Swing GUIs?

...creen looks so.. "splash-screen'ish". I keep waiting for them to disappear and the real GUI to appear! Since Java 1.5 we've had access to Window.setLocationByPlatform(boolean). which.. Sets whether this Window should appear at the default location for the native windowing system or at the curre...
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How to access environment variable values?

... print(os.environ.get('KEY_THAT_MIGHT_EXIST')) # os.getenv is equivalent, and can also give a default value instead of `None` print(os.getenv('KEY_THAT_MIGHT_EXIST', default_value)) Python default installation on Windows is C:\Python. If you want to find out while running python you can do: impo...
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Ubuntu rails install fails on zlib

...0 as my dev box; it's my first serious foray into Linux as a daily-use OS, and I'm having a hard time getting Rails going. I have followed a number of tutorials which all seem to work fine, but when I try and use gem install or gem update on anything, I get an error that looks like this: ...
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How to remove all callbacks from a Handler?

I have a Handler from my sub-Activity that was called by the main Activity . This Handler is used by sub-classes to postDelay some Runnables, and I can't manage them. Now, in the onStop event, I need to remove them before finishing the Activity (somehow I called finish() , but it still call ...
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Deleting folders in python recursively

... Try rmtree() in shutil from the Python standard library share | improve this answer | follow | ...
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What isandroid.R.layout.simple_list_item_1”?

I've started learning Android development and am following a todolist example from a book: 7 Answers ...
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Disable Interpolation when Scaling a

...ords, this has everything to do with interpolation of scaled elements , and nothing to do with antialiasing of graphics being drawn on a canvas. I'm not concerned with how the browser draws lines; I care about how the browser renders the canvas element itself when it is scaled up. ...
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How to set the current working directory? [duplicate]

... I usually use os.getcwd() first, and that shows me the format of the accepted input for os.chdir(). – Rani Kheir Apr 21 '16 at 9:22 a...
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Python multiprocessing PicklingError: Can't pickle

I am sorry that I can't reproduce the error with a simpler example, and my code is too complicated to post. If I run the program in IPython shell instead of the regular Python, things work out well. ...