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How to get current time in milliseconds in PHP?
...time(true) on the other hand returns the current time in seconds since the Unix epoch accurate to the nearest microsecond (see PHP reference). It's actually very easy to test if you run the above code in a loop and display the milliseconds.
– laurent
Dec 18 '12...
How to set environment variable for everyone under my linux system?
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Amazingly, Unix and Linux do not actually have a place to set global environment variables. The best you can do is arrange for any specific shell to have a site-specific initialization.
If you put it in /etc/profile, that will take car...
How to split a file into equal parts, without breaking individual lines? [duplicate]
...xcept for the last), without breaking the line? Using the split command in Unix, lines may be broken in half. Is there a way to, say, split up a file in 5 equal parts, but have it still only consist of whole lines (it's no problem if one of the files is a little larger or smaller)? I know I could ju...
Location of my.cnf file on macOS
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In general, on Unix and Unix-like systems, MySQL/MariaDB programs read config/startup files in the following locations (in the specified order):
/etc/my.cnf - Global
/etc/mysql/my.cnf - Global
SYSCONFDIR/my.cnf - Global
SYSCONFDIR r...
Pinging servers in Python
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This function works in any OS (Unix, Linux, macOS, and Windows)
Python 2 and Python 3
EDITS:
By @radato os.system was replaced by subprocess.call. This avoids shell injection vulnerability in cases where your hostname string might not be validated.
impor...
How to detect the OS from a Bash script?
...ve a sh script of about 100 lines that works across a very wide variety of Unix platforms: any system I have used since 1988.
The key elements are
uname -p is processor type but is usually unknown on modern Unix platforms.
uname -m will give the "machine hardware name" on some Unix systems.
/bin/...
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...
OS detecting makefile
...e
The make command is the same on both platforms. The given output is on Unix-like OSes:
> make -C lib
make: Entering directory '/tmp/lib'
gcc -c hello.c -fPIC -o hello.o
# -c hello.c => hello.c is first file after ':' => Compile hello.c
# -fPIC => Position-Independent Code ...
Make sure only a single instance of a program is running
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This code is Linux specific. It uses 'abstract' UNIX domain sockets, but it is simple and won't leave stale lock files around. I prefer it to the solution above because it doesn't require a specially reserved TCP port.
try:
import socket
s = socket.socket(socket....
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...