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What is the difference between user variables and system variables?
What is the difference between user variables such as PATH , TMP , etc. and system variables?
5 Answers
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Get UIScrollView to scroll to the top
...RIGINAL
[self.scrollView setContentOffset:CGPointZero animated:YES];
or if you want to preserve the horizontal scroll position and just reset the vertical position:
[self.scrollView setContentOffset:CGPointMake(self.scrollView.contentOffset.x, 0)
animated:YES];
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Where to place $PATH variable assertions in zsh?
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tl;dr version: use ~/.zshrc
And read the man page to understand the differences between:
~/.zshrc, ~/.zshenv and ~/.zprofile.
Regarding my comment
In my comment attached to the answer kev gave, I said:
This seems to be incorrect - /etc/profile isn't listed in any zsh documentati...
How to use HTML Agility pack
... ParseErrors is an ArrayList containing any errors from the Load statement
if (htmlDoc.ParseErrors != null && htmlDoc.ParseErrors.Count() > 0)
{
// Handle any parse errors as required
}
else
{
if (htmlDoc.DocumentNode != null)
{
HtmlAgilityPack.HtmlNode bodyNode = ht...
How to make a phone call programmatically?
...esn't do anything.
Don't forget to add the relevant permission to your manifest:
<uses-permission android:name="android.permission.CALL_PHONE" />
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nginx: send all requests to a single html page
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Note -- this will first check for the file requested, and if it's not there, it will serve base.html. So make sure that you've got no old extra files sitting around in your document root directory, or they'll get served directly if queried.
– Alex Howansky
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GitHub pages are not updating
... again, I think the filenames have md5sum (or something) and should change if the file changes, so it should update the index.html script tag as well.
– jmjm
Jan 19 '19 at 18:28
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How to remove a lambda event handler [duplicate]
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The C# specification explicitly states (IIRC) that if you have two anonymous functions (anonymous methods or lambda expressions) it may or may not create equal delegates from that code. (Two delegates are equal if they have equal target...
What does “%.*s” mean in printf?
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You can use an asterisk (*) to pass the width specifier/precision to printf(), rather than hard coding it into the format string, i.e.
void f(const char *str, int str_len)
{
printf("%.*s\n", str_len, str);
}
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How can I extract a good quality JPEG image from a video file with ffmpeg?
...v 4 -frames:v 1 output.jpg
This will work with any video input. See below if your input is MJPEG.
MJPEG
If your input is MJPEG (Motion JPEG) then the images can be extracted without any quality loss.
The ffmpeg or ffprobe console output can tell you if your input is MJPEG:
$ ffprobe -v error -sele...