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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...
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.
...
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 ...
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
...
Clear terminal in Python [duplicate]
...rm solution would be to use either the cls command on Windows, or clear on Unix systems. Used with os.system, this makes a nice one-liner:
import os
os.system('cls' if os.name == 'nt' else 'clear')
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总结const_cast、static_cast、dynamic_cast、reinterpret_cast - C/C++ - ...
...ref_b的实际类型，这样怎么也骗不过去了。
在应用多态编程时，当我们无法确定传过来的对象的实际类型时使用dynamic_cast，如果能保证对象的实际类型，用static_cast就可以了。至于reinterpret_cast，我很喜欢，很象c语言那样的暴力...
Reminder - \r\n or \n\r?
...e, which accordingly to MSDN it is:
A string containing "\r\n" for non-Unix platforms, or a string containing "\n" for Unix platforms.
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What's the difference between a file descriptor and file pointer?
...ened file (or socket, or whatever) at the kernel level, in Linux and other Unix-like systems.
You pass "naked" file descriptors to actual Unix calls, such as read(), write() and so on.
A FILE pointer is a C standard library-level construct, used to represent a file. The FILE wraps the file descrip...
How to get the start time of a long-running Linux process?
... Be aware that lstart time can change, the stat methods below are safer - unix.stackexchange.com/questions/274610/….
– slm
Jun 20 '19 at 15:13
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