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How to empty (“truncate”) a file on linux that already exists and is protected in someway?
I have a file called error.log on my server that I need to frequently truncate. I have rw permissions for the file. Opening the file in vi > deleting all content > saving works (obviously). But when I try the below
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Split a String into an array in Swift?
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Colors with unix command “watch”?
Some commands that I use display colors, but when I use them with watch the colors disappears:
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What is Objective C++? [closed]
...eatures to C++ classes. For example, you cannot use Objective-C syntax to call a C++ object, you cannot add constructors or destructors to an Objective-C object, and you cannot use the keywords this and self interchangeably. The class hierarchies are separate; a C++ class cannot inherit from an Obje...
Difference between 3NF and BCNF in simple terms (must be able to explain to an 8-year old)
...in BCNF because there is no column (either key or non-key) that is functionally dependent on anything besides that key.
Because each pizza must have exactly one of each topping type, we know that (Pizza, Topping Type) is a candidate key. We also know intuitively that a given topping cannot belong ...
Linux 搭建NTP时间同步服务器 - 操作系统(内核) - 清泛网 - 专注C/C++及内核技术
Linux 搭建NTP时间同步服务器NTP服务器【Network Time Protocol（NTP】是用来使计算机时间同步化的一种协议，NTP服务器可以对其它服务器做时间同步化，从而达到时间统一。配置环境及要求：A、 假设10 8 9 0 NTP服务器【Network Time Protoco...
Windows下使用Anaconda环境安装tensorflow - 大数据 & AI - 清泛网 - 专注C/C++及内核技术
Windows下使用Anaconda环境安装tensorflow下载Anacondahttps: www continuum io downloads 下载你要安装的平台的安装包，记得下载python3 6的版本Anconda配置源设置国内镜像
下载Anaconda
https://www.continuum.io/downloads/
下载你要安装的平台...
Mac OS X 入门操作常见问题集锦（持续更新） - 更多技术 - 清泛网 - 专注C/...
Mac OS X 入门操作常见问题集锦（持续更新）如何截图：shift + command + 3 截整屏shift + command + 4 截窗口（默认png，并保存到桌面）shift + command + Ctrl + 4 如何截图：
shift + command + 3 截整屏
shift + command + 4 截窗口（默认png，并保存...
vim 命令与快捷键 - 更多技术 - 清泛网 - 专注C/C++及内核技术
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查找/替换
r:替换光标所在处
R:替换光标后的字符直到esc
u:取消，上一步ctrl+z(undo)
/string: 查找n next，N pre set:ic(忽略大小写)
:%s/old/new/g:全文替换
：n1,n2s/old/new/g n1 to n2
：n1,n2s/old/new/c 询问
保存/退出
ZZ=:wq
:wq! owner root
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Can HTML be embedded inside PHP “if” statement?
...uld like to embed HTML inside a PHP if statement, if it's even possible, because I'm thinking the HTML would appear before the PHP if statement is executed.
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