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Running a cron job on Linux every six hours

...got a *, and you've too many fields. It's the hour you need to care about 0 */6 * * * /path/to/mycommand This means every sixth hour starting from 0, i.e. at hour 0, 6, 12 and 18 which you could write as 0 0,6,12,18 * * * /path/to/mycommand ...
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Android Studio rendering problems

I'm using Android Studio 0.2.3 and when opened an activity layout normally, the preview should appear on the right side, so that I can switch between Text and Design mode, which should again show the preview of the layout. ...
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Javascript Functions and default parameters, not working in IE and Chrome

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Python int to binary string?

... 800 Python's string format method can take a format spec. >>> "{0:b}".format(37) '100101...
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理解和配置 Linux 下的 OOM Killer - 操作系统(内核) - 清泛网 - 专注C/C++及内核技术

...rocess 9682, UID 27, (mysqld) total-vm:47388kB, anon-rss:3744kB, file-rss:80kB httpd invoked oom-killer: gfp_mask=0x201da, order=0, oom_adj=0, oom_score_adj=0 httpd cpuset=/ mems_allowed=0 Pid: 8911, comm: httpd Not tainted 2.6.32-279.1.1.el6.i686 #1 ... 21556 total pagecache pages 21049...
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How do I compare version numbers in Python?

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php - get numeric index of associative array

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Make footer stick to bottom of page correctly [duplicate]

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How to find out which package version is loaded in R?

...ty cluster. It has 2 versions of R installed. System wide R 2.11 (Debian 6.0) and R 2.14.2 in non-standard location. 12 An...
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Is short-circuiting logical operators mandated? And evaluation order?

...| edited Sep 23 '11 at 15:07 answered Mar 10 '09 at 0:37 Al...