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Multiline bash commands in makefile
I have a very comfortable way to compile my project via a few lines of bash commands. But now I need to compile it via makefile. Considering, that every command is run in its own shell, my question is what is the best way to run multi-line bash command, depended on each other, in makefile?
For exa...
Linux bash: Multiple variable assignment
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First thing that comes into my mind:
read -r a b c <<<$(echo 1 2 3) ; echo "$a|$b|$c"
output is, unsurprisingly
1|2|3
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See what process is using a file in Mac OS X
...s it's in use by Preview but Preview doesn't seem to be running (eg when I command-tab through the running apps) but Activity Monitor does show it to be running. Stupid Preview.
– Dave Sag
Aug 15 '12 at 1:27
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Ignoring time zones altogether in Rails and PostgreSQL
...poch, 2000-01-01 00:00:00 UTC.
Postgres also has built-in knowledge of the commonly used UNIX time counting seconds from the UNIX epoch, 1970-01-01 00:00:00 UTC, and uses that in functions to_timestamp(double precision) or EXTRACT(EPOCH FROM timestamptz).
The source code:
* Timestamps, as well as t...
JSON: why are forward slashes escaped?
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What's the difference between Invoke() and BeginInvoke()
...d.
Control.Invoke: Executes on the UI thread, but calling thread waits for completion before continuing.
Control.BeginInvoke: Executes on the UI thread, and calling thread doesn't wait for completion.
Tim's answer mentions when you might want to use BeginInvoke - although it was mostly geared towa...
Flexbox: center horizontally and vertically
...ds a height to see the vertical alignment effect, otherwise, the container computes the minimum height needed to enclose the content, which is less than the view port height in this example.
Footnote:
The flex-flow, flex-direction, flex-wrap properties could have made this design easier to implemen...
Add missing dates to pandas dataframe
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std::vector versus std::array in C++
... stack, the array itself will be on the stack. Its size has to be known at compile time (it's passed as a template parameter), and it cannot grow or shrink.
It's more limited than std::vector, but it's often more efficient, especially for small sizes, because in practice it's mostly a lightweight w...