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Checking if output of a command contains a certain string in a shell script
...d keeps running even after emitting string, in which case using grep -q -- by closing its stdin and exiting after the first instance of string is seen -- can be counterproductive]. (Re: "non-POSIX-compliant", &> is an extension -- see pubs.opengroup.org/onlinepubs/009695399/utilities/… desc...
Printing newlines with print() in R
...ng writeLines also allows you to dispense with the "\n" newline character, by using c(). As in:
writeLines(c("File not supplied.","Usage: ./program F=filename",[additional text for third line]))
This is helpful if you plan on writing a multiline message with combined fixed and variable input, su...
What is the “Temporary ASP.NET Files” folder for?
...e possibility of .NET assembly DLL's #(in the /bin folder) becoming locked by the ASP.NET worker process and thus not updatable.
ASP.NET watches for file changes in your website and will if necessary begin the whole process all over again.
Theoretically the folder shouldn't need any maintenance, b...
How to set initial size of std::vector?
... Allocating the size can also be provided during construction by passing in an integral argument (e.g. std::vector<Custom Class*> content(100);)
– adelbertc
Jul 12 '12 at 17:53
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How do I ALTER a PostgreSQL table and make a column unique?
... imageUploader: {
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Get the value of an instance variable given its name
...instance_variable_get("@#{name}")
There is no need to use + or intern; Ruby will handle this just fine. However, if you find yourself reaching into another object and pulling out its ivar, there's a reasonably good chance that you have broken encapsulation.
If you explicitly want to access an iva...
How do you check if a selector matches something in jQuery? [duplicate]
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As an ID can only exists once, and duplicates are ignored by JS and jQuery, this may lead to confusion if you do not explain that it is a 0 or 1 situation :)
– Gone Coding
Jul 17 '15 at 16:22
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How to set the UITableView Section title programmatically (iPhone/iPad)?
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Note that -(NSString *)tableView:
titleForHeaderInSection: is not called by UITableView if - (UIView *)tableView:(UITableView *)tableView viewForHeaderInSection:(NSInteger)section is implemented in delegate of UITableView;
...
What regex will match every character except comma ',' or semi-colon ';'?
...re using. Most of them have a Split method that takes delimiters and split by them. You might want to use that one with a "normal" (without ^) character class:
[,;]+
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Delete/Reset all entries in Core Data?
...xternal Record File) in iOS 5 and OS X 10.7, simply deleting files pointed by storeURLs is not enough. You'll leave the external record files behind. Since the naming scheme of these external record files is not public, I don't have a universal solution yet. – an0 May 8 '12 at 23:00
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