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How to make the 'cut' command treat same sequental delimiters as one?
...elimiters
offsets from end of line (using negative numbers) in addition to start of line
automatic side-by-side pasting of columns (no need to invoke paste separately)
support for field reordering
a config file where users can change their personal preferences
great emphasis on user friendliness &am...
How do I copy directories recursively with gulp?
...base default is "folder" as given in this answer. In other words, the base starts where the glob pattern begins. This helped me to understand where my files would end up and is also why you don't need the **/* in the gulp.dest parameter. Gulp takes everything in the glob and puts it in the dest fold...
Date vs DateTime
...d timezone nightmares if your server's timezone configs ever change... and starts writing data in ways you didn't anticipate. Datetime can save you there, date can't at all, and will become mindbendingly hard to fix if you ever start writing date down with the wrong timezone context.
...
What ports does RabbitMQ use?
...-env.conf
Ask the computer to tell you:
sudo nmap -p 1-65535 localhost
Starting Nmap 5.51 ( http://nmap.org ) at 2014-09-19 13:50 EDT
Nmap scan report for localhost (127.0.0.1)
Host is up (0.00041s latency).
PORT STATE SERVICE
443/tcp open https
5672/tcp open am...
Getting image dimensions without reading the entire file
... (ArgumentException e)
{
if (e.Message.StartsWith(errorMessage))
{
throw new ArgumentException(errorMessage, "path", e);
}
else
{
throw ...
Can I scroll a ScrollView programmatically in Android?
...lScroll(mScrollView.FOCUS_DOWN);
}
});
if You want to scroll to start
mScrollView.post(new Runnable() {
public void run() {
mScrollView.fullScroll(mScrollView.FOCUS_UP);
}
});
sh...
关于App Inventor 2过程积木，被问最多的6个问题 - App应用开发 - 清泛IT社...
...creen传值</b>：利用 <font face="Courier New">open another screen with start value</font> 和 <font face="Courier New">get start value</font> 积木把数据在不同屏幕间传递。<br><br><br>如果你发现同一段逻辑在多个Screen里重复出现，更好的做法是把它<b>放在一...
What's the difference between Perl's backticks, system, and exec?
...erlfunc, because it is a function.
E.g.:
#!/usr/bin/perl
print "Need to start exec command";
my $data2 = exec('ls');
print "Now END exec command";
print "Hello $data2\n\n";
In above code, there are three print statements, but due to exec leaving the script, only the first print statement is exe...
BSS段、数据段、代码段、堆与栈 剖析 - C/C++ - 清泛网 - 专注C/C++及内核技术
...中未初始化的全局变量的一块内存区域。BSS 是英文Block Started by Symbol 的...BSS 段：BSS 段（bss segment）通常是指用来存放程序中未初始化的全局变量的一块内存区域。BSS 是英文Block Started by Symbol 的简称。BSS 段属于静态内存分配。
...
App Inventor 2 扩展 · App Inventor 2 中文网
...2 Test your extension
3.3 Details on creating extensions
3.3.1 When you start to build
3.3.2 Requesting permissions for the extensions you define
3.2.3 Using external libraries
3.2.4 Choosing a package name for your extension
3.4 Sharing your extension
Acknowledgements
Appendix A: Temporary...