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How to base64 encode image in linux bash / shell
...ilename itself.
test="$(cat DSC_0251.JPG | base64)"
However, base64 can read from the file itself:
test=$( base64 DSC_0251.JPG )
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Why can a class not be defined as protected?
... package-private which is similar to defining it as default which we can already do.
Therefore there is no benefit of defining a class private it will only make things ambiguous.
For more information read Why an outer Java class can’t be private or protected
...
How do I check if a given string is a legal/valid file name under Windows?
...
I read the same article mentioned in this answer and found through experimentation that COM0 and LPT0 are also not allowed. @dlf this one works with filenames that begin with '.': ^(?!^(?:PRN|AUX|CLOCK\$|NUL|CON|COM\d|LPT\d)(?...
Hashset vs Treeset
...sal.
None of these implementations are synchronized. That is if multiple threads access a set concurrently, and at least one of the threads modifies the set, it must be synchronized externally.
LinkedHashSet is in some sense intermediate between HashSet and TreeSet. Implemented as a hash table with ...
.NET - Dictionary locking vs. ConcurrentDictionary
...
A thread-safe collection vs. a non-threadsafe-collection can be looked upon in a different way.
Consider a store with no clerk, except at checkout. You have a ton of problems if people don't act responsibly. For instance, let's ...
How do I create a list of random numbers without duplicates?
..., 10)
With reference to your specific code example, you probably want to read all the lines from the file once and then select random lines from the saved list in memory. For example:
all_lines = f1.readlines()
for i in range(50):
lines = random.sample(all_lines, 40)
This way, you only need...
How to find out which processes are using swap space in Linux?
...ferenced by the process yet. In this case it's not necessary for the OS to read the complete binary from disk into memory, and thus the value of RES doesn't include this part of memory.
– Bart
Mar 5 '12 at 14:53
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Best way to make Django's login_required the default
...func, view_args, view_kwargs):
# No need to process URLs if user already logged in
if request.user.is_authenticated():
return None
# An exception match should immediately return None
for url in self.exceptions:
if url.match(request.path):
...
PHP parse/syntax errors; and how to solve them
...ways take:
Use proper code indentation, or adopt any lofty coding style.
Readability prevents irregularities.
Use an IDE or editor for PHP with syntax highlighting.
Which also help with parentheses/bracket balancing.
Read the language reference and examples in the manual.
Twice, to become somewh...
Does have to be in the of an HTML document?
...torically. If you care about the details of the spec and its history, keep reading.
No matter what the spec says, using style elements in the body does more-or-less work in all major browsers. However, it is considered a bad practice both because it violates spec and because it can cause undesirable...