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Unable to copy file - access to the path is denied
... in my case the reason that folder and the solution turned into ReadOnly and subsequently VS had trouble building it, was because some file failed to synch to GoogleDrive and got somehow locked by that process. So for me to rebuild properly I had to close GoogleDrive and then it built jus...
ConcurrentHashMap vs Synchronized HashMap
...ock.
Locking the entire collection is a performance overhead. While one thread holds on to the lock, no other thread can use the collection.
ConcurrentHashMap was introduced in JDK 5.
There is no locking at the object level,The locking is at a much finer granularity. For a ConcurrentHashMap, the...
Difference Between ViewData and TempData?
...ta is saved into TempDataDictionary object:
It persists in it and can be read from any view or any action in any controller
It can only be read once; once read, it becomes null
It is saved into session so on expiration of session data is lost.
This behavior is new from ASP.NET MVC 2 and latter ...
How do I remove the border around a focused contenteditable pre?
...
You can also add the :read-write pseudo-class to style elements that are editable.
For instance (jsFiddle):
.element:read-write:focus {
outline: none;
}
Read more here on codrops.
The :read-write pseudo-class selector is supported in ...
How do I grab an INI value within a shell script?
... above, e.g. grep =), the same for other unexpected errors.
If you need to read specific value under specific section, use grep -A, sed, awk or ex).
E.g.
source <(grep = <(grep -A5 '\[section-b\]' file.ini))
Note: Where -A5 is the number of rows to read in the section. Replace source with c...
How to solve error “Missing `secret_key_base` for 'production' environment” (Rails 4.1)
...und out that Rails 4.1 changed the way to manage the secret_key, so if you read the secrets.yml file located at exampleRailsProject/config/secrets.yml you'll find something like this:
# Do not keep production secrets in the repository,
# instead read values from the environment.
production:
secre...
Search and replace a line in a file in Python
... I would be wary of using it in real code because admittedly it's not very readable or familiar. In real (production) code it's worthwhile to spend just a few more lines of code to make the process explicit and thus make the code readable.
There are two options:
The file is not overly large, and ...
How can I pipe stderr, and not stdout?
...edirect stderr to stdout and then stdout to /dev/null' -- Since one has to read redirection chains from right to left (not from left to right), we should also adapt our plain text explanation to this: 'Redirect stdout to /dev/null, and then stderr to where stdout used to be'.
–...
How to check if a file is empty in Bash?
...efaults set for ls that use the long format (like me) and the shell will already expand *.txt on its own. Just do for file in *.txt instead.
– Lilith
Jun 26 '18 at 17:19
...
When to use volatile with multi threading?
If there are two threads accessing a global variable then many tutorials say make the variable volatile to prevent the compiler caching the variable in a register and it thus not getting updated correctly.
However two threads both accessing a shared variable is something which calls for protection v...