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Command to get nth line of STDOUT
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What does the p mean? like 2p 3p? In the sense I understand that it's for 2/3 line, but what's the theory/understanding behind it?
– Leo Ufimtsev
Dec 6 '17 at 22:18
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Why doesn't JavaScript support multithreading?
... process-model than a thread-model. Web workers use message passing as the means of communication, which is an elegant solution to the 'usual' concurrency issues in multithreaded applications. I am not sure if they can actually operate on the same objects as the main page concurrently. They cannot a...
How to verify if a file exists in a batch file?
...h script to delete everything in a folder except one
Finally copying just means calling COPY and calling another bat file can be done like this:
MYOTHERBATFILE.BAT sync.bat myprogram.ini
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Convert an image (selected by path) to base64 string
...t, which returns which format the image was in when it was read from file, meaning in this case, it'd return the gif format. So it changes nothing, except that instead of the actual original file's bytes, you have the bytes of the image as re-saved to gif by the .Net framework.
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Get underlined text with Markdown
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@TobyBartels I'm not sure what you mean. "The <u> element represents a span of text with an unarticulated, though explicitly rendered, non-textual annotation," whereas "the <ins> element represents an addition to the document." These are two semant...
What is the difference between memmove and memcpy?
...he destination cannot overlap the source at all. With memmove it can. This means that memmove might be very slightly slower than memcpy, as it cannot make the same assumptions.
For example, memcpy might always copy addresses from low to high. If the destination overlaps after the source, this means...
Reading and writing binary file
... I already mentioned it works with char[] too and files of any size which means there's no condition that file size should be a multiple of buffer size.
– iMajetyHK
Sep 9 '18 at 16:04
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The cast to value type 'Int32' failed because the materialized value is null
...from u in context.User
join ch in context.CreditHistory on u.ID equals ch.UserID
where u.ID == userID
select (int?)ch.Amount).Sum() ?? 0;
This first casts to int? to tell the C# compiler that this expression can inde...
Counting the number of option tags in a select tag in jQuery
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The W3C solution:
var len = document.getElementById("input1").length;
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Get selected value in dropdown list using JavaScript
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If you have a select element that looks like this:
<select id="ddlViewBy">
<option value="1">test1</option>
<option value="2" selected="selected">test2</option>
<option value="3">test3</option>
</select>
Running this code:
var e =...