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

I'm looking 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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Can I change the viewport meta tag in mobile safari on the fly?

...]"); viewport.setAttribute('content', 'width=device-width, initial-scale=1.0, maximum-scale=1.0, user-scalable=0'); Just change the parts you need and Mobile Safari will respect the new settings. Update: If you don't already have the meta viewport tag in the source, you can append it directly wi...
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Change column type from string to float in Pandas

... +200 You have four main options for converting types in pandas: to_numeric() - provides functionality to safely convert non-numeric types...
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Difference between Math.Floor() and Math.Truncate()

...| edited May 23 '17 at 12:03 Community♦ 111 silver badge answered Aug 1 '08 at 12:26 ...
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Reduce left and right margins in matplotlib plot

...E.g. import matplotlib.pyplot as plt import numpy as np data = np.arange(3000).reshape((100,30)) plt.imshow(data) plt.savefig('test.png', bbox_inches='tight') Another way is to use fig.tight_layout() import matplotlib.pyplot as plt import numpy as np xs = np.linspace(0, 1, 20); ys = np.sin(xs) ...
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How to define different dependencies for different product flavors

... 190 To define a flavor specific dependency you can use proCompile instead of compile in your depende...
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What does |= (ior) do in Python?

... Here we apply merge (|) and update (|=) to dicts: >>> d1 = {"a": 0, "b": 1, "c": 2} >>> d2 = {"c": 20, "d": 30} >>> # Merge, | >>> d1 | d2 {"a": 0, "b": 1, "c": 20, "d": 30} >>> d1 {"a": 0, "b": 1, "c": 2} >>> # Update, |= >>> d1 |=...
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CSS I want a div to be on top of everything

... dev.bv 93099 silver badges1616 bronze badges answered Sep 14 '11 at 19:22 Skylar AndersonSkylar Anderson ...
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How to deal with floating point number precision in JavaScript?

...st irritated that their programs don't work correctly with numbers like 1/10 without realizing that they wouldn't even blink at the same error if it occurred with 1/3. If the first point really applies to you, use BigDecimal for JavaScript, which is not elegant at all, but actually solves the probl...
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Empty arrays seem to equal true and false at the same time

... d_ethier 3,6042020 silver badges3030 bronze badges answered Mar 30 '11 at 20:10 wildcardwildcard ...