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When do you use the Bridge Pattern? How is it different from Adapter pattern?
...atterns" by the GoF, where implementation is platform dependent: IBM's PM, UNIX's X etc.
– clapas
Sep 6 '17 at 16:12
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What's the easiest way to install a missing Perl module?
...
On Unix:
usually you start cpan in your shell:
# cpan
and type
install Chocolate::Belgian
or in short form:
cpan Chocolate::Belgian
On Windows:
If you're using ActivePerl on Windows, the PPM (Perl Package Manager) has...
What's the bad magic number error?
...
The magic number comes from UNIX-type systems where the first few bytes of a file held a marker indicating the file type.
Python puts a similar marker into its pyc files when it creates them.
Then the python interpreter makes sure this number is corre...
What is Pseudo TTY-Allocation? (SSH and Github)
... has no definitive meaning, though "tty" is the name for a terminal in the Unix tradition, usually held to be short for Teletype.
Other use-cases for -T (beside testing)
Transferring binary files
Execute commands on a remote server
SSH tunneling: ssh -fnT -L port:server:port user@server (-f for...
How to replace a string in multiple files in linux command line
... If anybody want to look for more options, there is an answer on unix stack exchange which covers more use cases site unix.stackexchange.com/a/112024/13488
– Reddy
May 22 '15 at 9:40
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How do I get time of a Python program's execution?
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In Linux or Unix:
$ time python yourprogram.py
In Windows, see this StackOverflow question: How do I measure execution time of a command on the Windows command line?
For more verbose output,
$ time -v python yourprogram.py
Comm...
Is it acceptable and safe to run pip install under sudo?
...omeone who asks such an entry level question is probably not familiar with unix's permission system and therefore running a 1-user install it doesn't matter. Also your answer actually fails to address the use case of me actually WANTING to install to global packages. After doing that I could easily ...
Test whether a glob has any matches in bash
... is a bash-specific built-in command and is not part of the POSIX standard Unix shell specified built-in commands. pubs.opengroup.org/onlinepubs/9699919799 pubs.opengroup.org/onlinepubs/9699919799/utilities/… Therefore, avoid using it in scripts where portability to other shells is a concern.
...
How to get current timestamp in milliseconds since 1970 just the way Java gets
... the std::chrono library. You can use it to get the milliseconds since the Unix Epoch like this:
#include <chrono>
// ...
using namespace std::chrono;
milliseconds ms = duration_cast< milliseconds >(
system_clock::now().time_since_epoch()
);
...
构建高并发高可用的电商平台架构实践 - 更多技术 - 清泛网 - 专注C/C++及内核技术
...实时性的场景，主要用于离线的分析。
基于MapRduce模型编程做数据的分析，开发上效率不高，位于hadoop之上Hive的出现使得数据的分析可以类似编写sql的方式进行，sql经过语法分析、生成执行计划后最终生成MapReduce任务进行执行...