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Docker - how can I copy a file from an image to a host?

... Actually, I use docker run --rm --entrypoint tar _image_ cC _img_directory_ . | tar xvC _host_directory_ – caligari Nov 30 '17 at 11:04 add a comment...
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Hidden features of Perl?

... Cool! !!$undef_var doesn't create a warning. – Axeman Oct 2 '08 at 20:40 4 ...
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Iterate keys in a C++ map

...te on the keys instead of the pairs), then take a look at Boost's transform_iterator. [Tip: when looking at Boost documentation for a new class, read the "examples" at the end first. You then have a sporting chance of figuring out what on earth the rest of it is talking about :-)] ...
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如何查看Oracle用户的SQL执行历史记录? - 数据库(内核) - 清泛网 - 专注C/...

...e用户的SQL执行历史记录?select * from v$sqlarea t order by t LAST_ACTIVE_TIME desc注意 :执行此语句等等一些相关的语句 必须具有DBA 的权限 虽然 select * from v$sqlarea t order by t.LAST_ACTIVE_TIME desc 注意 :执行此语句等等一些相关的语句 必...
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What's a good rate limiting algorithm?

...sages per = 8.0; // unit: seconds allowance = rate; // unit: messages last_check = now(); // floating-point, e.g. usec accuracy. Unit: seconds when (message_received): current = now(); time_passed = current - last_check; last_check = current; allowance += time_passed * (rate / per); if (...
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Python: Tuples/dictionaries as keys, select, sort

...u wish. For this case, I'd use the following class: class Fruit: def __init__(self, name, color, quantity): self.name = name self.color = color self.quantity = quantity def __str__(self): return "Name: %s, Color: %s, Quantity: %s" % \ (self.name, self...
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Get Unix Epoch Time in Swift

...alSince1970) let preciseMilliseconds = Int(Date().timeIntervalSince1970 * 1_000) let preciseMicroseconds = Int(Date().timeIntervalSince1970 * 1_000_000) // most likely precise Unfortunately, however, in the year 2038, 32-bit numbers won't be usable for the Unix timestamp and they'll have to be 64-...
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What is the best way to create constants in Objective-C

...s, enum is great and you absolutely should use it. (Even better, use the NS_ENUM and NS_OPTIONS macros.) For other things, you must use something else; enum does not do anything but integers. And other questions I was thinking about importing the file in the Reddit-Prefix.pch file to make the c...
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How can I quickly sum all numbers in a file?

...ing as the awk solution in Ayman Hourieh's answer: % perl -nle '$sum += $_ } END { print $sum' If you're curious what Perl one-liners do, you can deparse them: % perl -MO=Deparse -nle '$sum += $_ } END { print $sum' The result is a more verbose version of the program, in a form that no one ...
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Cast Int to enum in Java

...olean Compare(int i){return id == i;} public static A GetValue(int _id) { A[] As = A.values(); for(int i = 0; i < As.length; i++) { if(As[i].Compare(_id)) return As[i]; } return A.None;...