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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
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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...
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...
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...
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...
How to run Rake tasks from within Rake tasks?
...I needed a solution like this, is because rake task loading takes a lot of time. By implementing a solution like above, will it save on loading time?
– Dipan Mehta
Dec 11 '18 at 10:44
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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 ...
EditText maxLines not working - user can still input more lines than set
... are right! I worked after setting inputType to text. Thanks for saving my time :-)
– byJeevan
Jan 23 '17 at 5:41
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