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Verify a certificate chain using openssl verify
...rver -key "$KEY" -cert "$CRT" "$@" -www &
PID=$!
sleep .5 # give it time to startup
}
check()
{
while read -r line
do
case "$line" in
'Verify return code: 0 (ok)') return 0;;
'Verify return code: '*) return 1;;
# *) echo "::: $line :::";;
esac
done < <(echo | op...
Java8 Lambdas vs Anonymous classes
...ies, so further methods can be called on it, its state can be mutated over time, etc. None of these apply to lambdas.
I'd guess that the majority of uses of AICs were to provide stateless implementations of single functions and so can be replaced with lambda expressions, but there are other uses of ...
JavaScript: Get image dimensions
...
additional info - although this worked for me first time it was intermittent. I think the problem is because the image has not been downloaded. I fixed by running the code which uses the dimension in the onload event handler like so: img.onload = function () {};
...
Convert xlsx to csv in Linux with command line
...ats, but I could not make it work (it would simply open a blank file every time, even with the --headless argument).
– sleblanc
Aug 15 '13 at 17:24
...
What is a Shim?
...ch all provide “shim” type functionality. In most fields it’s often times the use and or miss use of different acronyms for the same root concept that causes people confusion. Using the word “shim” to describe the more specific “Structural” design patterns "Proxy", "Adapter" and "Fac...
What are enums and why are they useful?
... you use enums instead of integers (or String codes), you increase compile-time checking and avoid errors from passing in invalid constants, and you document which values are legal to use.
BTW, overuse of enums might mean that your methods do too much (it's often better to have several separate met...
Can someone explain in simple terms to me what a directed acyclic graph is?
...following the edges, you will never encounter the same node for the second time.
A good example of a directed acyclic graph is a tree. Note, however, that not all directed acyclic graphs are trees.
share
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Can a variable number of arguments be passed to a function?
...
Also important...one may find a time when they have to pass an unknown number of arguments to a function. In a case like this call your "manyArgs" by creating a list called "args" and passing that to manyArgs like this "manyArgs(*args)"
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IPC performance: Named Pipe vs Socket
...ow well everything else is written), but end up with code that spends more time blocking for an IPC reply than it does doing useful work. Sure, non-blocking schemes help this, but those can be tricky. Spending years bringing old code into the modern age, I can say, the speedup is almost nil in the m...
When to use IMG vs. CSS background-image?
...y default.
—JayTee
Use background-image if you need to improve download times, as
with CSS sprites.
Use background-image if you need for only a portion of the image to be visible, as with CSS sprites.
Use background-image with background-size:cover in order to stretch a background image to fill ...