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How to list running screen sessions?
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To list all of the screen sessions for a user, run the following command as that user:
screen -ls
To see all screen sessions on a specific machine you can do:
ls -laR /var/run/screen/
I get this on my machine:
gentle ~ # ls -laR /var/run/screen/
/var/run/screen/:
total 1
drwxrwxr-x 4 ...
Media Queries: How to target desktop, tablet, and mobile?
I have been doing some research on media queries and I still don't quite understand how to target devices of certain sizes.
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const char * const versus const char *?
I'm running through some example programs to refamiliarize myself with C++ and I have run into the following question. First, here is the example code:
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理解Python的 with 语句 - 大数据 & AI - 清泛网 - 专注C/C++及内核技术
... convenient way of dealing with the situation where you have to do a setup and teardown to make something happen. A very good example for this is the situation where you want to gain a handler to a file, read data from the file and the close the file handler.
有一些任务，可能事先需要设...
How does Zalgo text work?
...e it undermines my notion of what a character is supposed to be. My understanding is that a character is supposed to move horizontally across a line and stay within a certain "container". Obviously the Zalgo text is moving vertically and doesn't seem to be restricted to any space.
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Piping command output to tee but also save exit code of command [duplicate]
I have a shell script in which I wrap a command (mvn clean install), to redirect the output to a logfile.
4 Answers
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How do I return early from a rake task?
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next
puts "never printed"
end
Or you can move the code in a method and use return in the method.
task :foo do
do_something
end
def do_something
puts "startd"
return
puts "end"
end
I prefer the second choice.
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Get all child views inside LinearLayout at once
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Use getChildCount() and getChildAt(int index).
Example:
LinearLayout ll = …
final int childCount = ll.getChildCount();
for (int i = 0; i < childCount; i++) {
View v = ll.getChildAt(i);
// Do something with v.
// …
}
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How can I add a class attribute to an HTML element generated by MVC's HTML Helpers?
... using HTML Helpers, for example @Html.ActionLink() , @Html.BeginForm() and so on.
2 Answers
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Create a File object in memory from a string in Java
... file - passing an "empty" File object won't work.
– Andrei Volgin
Nov 5 '19 at 17:16
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