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/etc/apt/sources.list" E212: Can't open file for writing
... of how to save those changes:
One time Setup demo to create a root owned read only file for a lower user:
sudo touch temp.txt
sudo chown root:root temp.txt
sudo chmod 775 temp.txt
whoami
el
First open the file as normal user:
vi temp.txt
Then make some changes to the file, it warns you its r...
SHA1 vs md5 vs SHA256: which to use for a PHP login?
...in, and I'm trying to decide whether to use SHA1 or Md5, or SHA256 which I read about in another stackoverflow article. Are any of them more secure than others? For SHA1/256, do I still use a salt?
...
What is the 'new' keyword in JavaScript?
... to Function.prototype, numbers to Number.prototype, etc.). It can only be read with Object.getPrototypeOf(someObject). There is no other way to set or read this value.
Functions, in addition to the hidden [[prototype]] property, also have a property called prototype, and it is this that you can ac...
Play audio with Python
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Reading this made me so emotional. My eyes literally teared up with happiness. Did not expect that kind of reaction from myself. (They linked to a module I made.)
– ArtOfWarfare
Jan 24 '...
How do I programmatically get the GUID of an application in .net2.0
...
You should be able to read the Guid attribute of the assembly via reflection. This will get the GUID for the current assembly
Assembly asm = Assembly.GetExecutingAssembly();
var attribs = (asm.GetCustomAttributes(typeof(GuidAttri...
Make a UIButton programmatically in Swift
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Inversely, anyone reading this may also want to know that if your button action references a function that takes no parameter, the colon is not needed and may even cause an error if not removed.
– Dave G
...
How do I look inside a Python object?
...
First, read the source.
Second, use the dir() function.
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Fast way of finding lines in one file that are not in another?
...ne in a line-content indexed associative array ss2[]. After both files are read, iterate over ll1 and use the in operator to determine if the line in file1 is present in file2. (This will have have different output to the diff method if there are duplicates.)
In the event that the files are suffici...
u'\ufeff' in Python string
...automatically handle the encoding.
Without it, the BOM is included in the read result:
>>> f = open('file', mode='r')
>>> f.read()
'\ufefftest'
Giving the correct encoding, the BOM is omitted in the result:
>>> f = open('file', mode='r', encoding='utf-8-sig')
>>...
IEnumerable vs List - What to Use? How do they work?
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When I've read the answers about: IEnumerable<T> vs IQueryable<T> I saw the analogical explanation, so that IEnumerable automatically forces the runtime to use LINQ to Objects to query the collection. So I'm confused betwee...