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How to find out the number of CPUs using python
...t; 0:
return res
except OSError:
pass
# Other UNIXes (heuristic)
try:
try:
dmesg = open('/var/run/dmesg.boot').read()
except IOError:
dmesgProcess = subprocess.Popen(['dmesg'], stdout=subprocess.PIPE)
dmesg = dmesgP...
How do I execute a command and get the output of the command within C++ using POSIX?
...g...
It seems like nobody does things the hard way any more.
(Assuming a Unix/Linux/Mac environment, or perhaps Windows with a POSIX compatibility layer...)
enum PIPE_FILE_DESCRIPTERS
{
READ_FD = 0,
WRITE_FD = 1
};
enum CONSTANTS
{
BUFFER_SIZE = 100
};
int
main()
{
int parentToCh...
How to call one shell script from another shell script?
...
Remember to change format/encoding of executable files in unix if they are created in DOS and then uploaded to unix environment -> dos2unix <script name>
– Abhishek Chatterjee
Feb 5 '14 at 6:19
...
Purpose of #!/usr/bin/python3
... figure out what program should be started to interpret the script.
A non Unix based OS will use its own rules for figuring out how to run the script. Windows for example will use the filename extension and the # will cause the first line to be treated as a comment.
If the path to the Python execu...
C++ Lock-free Hazard Pointer（冒险指针） - C/C++ - 清泛网 - 专注C/C++及内核技术
...还没有太多的了解。本文主要介绍 Hazard Pointer，一种无锁编程中广泛使用的安全内存回收方法，适用于需要高性能读、读多写少的场景。其论文可参考文献 1，标准草案可参考文献 2，代码实现可参考 Folly 中的 HazPtr。
2. Hazard Poi...
MFC学习总结 (90个技巧) dlg 上建立View - C/C++ - 清泛网 - 专注C++内核技术
... pSubMenu->RemoveMenu(1,MF_BYPOSITION);
[page]VC++中的3D按钮的编程[/page]26. VC++中的3D按钮的编程
运 行AppWizard生成一个基于对话框的test工程，在对话框中加入一个CButton控件。在CButton控件的General属性页将控件的 ID改为IDC_3DTEXTBTN，Capti...
How do I get the current date and time in PHP?
...'); // MySQL datetime format
echo $now->getTimestamp(); // Unix Timestamp -- Since PHP 5.3
And to specify the timezone:
$now = new DateTime(null, new DateTimeZone('America/New_York'));
$now->setTimezone(new DateTimeZone('Europe/London')); // Another way
echo $now->getTime...
Run R script from command line
...int('hello')
}
sayHello()
I will also note that if you're running on a *unix system there is the useful littler package which provides easy command line piping to R. It may be necessary to use littler to run shiny apps via a script? Further details can be found in this question.
...
How to read a single char from the console in Java (as the user types it)?
...d) as opposed to "cooked" mode (line editing with enter key required.) On UNIX systems, the 'stty' command can change modes.
Now, with respect to Java... see Non blocking console input in Python and Java. Excerpt:
If your program must be console based,
you have to switch your terminal out
...
Redirect all output to file [duplicate]
...; log_file_name 2>&1
Detail description of redirection operator in Unix/Linux.
The > operator redirects the output usually to a file but it can be to a device. You can also use >> to append.
If you don't specify a number then the standard output stream is assumed but you can also ...