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Bash script to receive and repass quoted parameters
...e c is the first character of the value of the IFS
variable. If IFS is unset, the parameters are separated by spaces. If
IFS is null, the parameters are joined without intervening separators.
$@ -- Expands to the positional parameters, starting from one. When
the expansion occurs within d...
Count number of rows within each group
I have a dataframe and I would like to count the number of rows within each group. I reguarly use the aggregate function to sum data as follows:
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Longest line in a file
I'm looking for a simple way to find the length of the longest line in a file. Ideally, it would be a simple bash shell command instead of a script.
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Boolean.hashCode()
... the hash codes for the components. If too small values are used in a hash set with a large number of buckets there's a risk of ending up with an uneven distribution of objects.
Do collisions matter? Booleans just have two different values anyway?
Maps can contain booleans together with other objec...
unix - head AND tail of file
Say you have a txt file, what is the command to view the top 10 lines and bottom 10 lines of file simultaneously?
20 Answer...
Mechanisms for tracking DB schema changes [closed]
...te an empty database for automated testing.
It took only a few hours to set up this system, it's conceptually simple and everyone gets the version numbering scheme, and it has been invaluable in having the ability to move forward and evolving the database design, without having to communicate or ...
How to clone all repos at once from GitHub?
...tories using the API.
Try this:
Create an API token by going to Account Settings -> Applications
Make a call to: http://${GITHUB_BASE_URL}/api/v3/orgs/${ORG_NAME}/repos?access_token=${ACCESS_TOKEN}
The response will be a JSON array of objects. Each object will include information about one of ...
Difference between mkdir() and mkdirs() in java for java.io.File [closed]
Can anyone tell me the difference between these two methods:
3 Answers
3
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c++11右值引用、std::move移动语义、std::forward完美转发的一些总结 - C/C...
c++11右值引用、std::move移动语义、std::forward完美转发的一些总结c++11_rvalue_move_forwardstd::move 实际上并不能移动任何东西，它唯一的功能是将一个左值强制转换为右值引用，继而用于移动语义。从实现上讲，它基本等同于一个类型...