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How to convert a string from uppercase to lowercase in Bash? [duplicate]
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If you are using bash 4 you can use the following approach:
x="HELLO"
echo $x # HELLO
y=${x,,}
echo $y # hello
z=${y^^}
echo $z # HELLO
Use only one , or ^ to make the first letter lowercase or uppercase.
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What's a good rate limiting algorithm?
...e.g., rate limit is 5 messages per 8 seconds, and the person triggers only 4), and the next trigger is over the 8 seconds (e.g., 16 seconds later), the bot sends the message, but the queue becomes full and the bot waits 8 seconds, even though it's not needed since the 8 second period has lapsed.
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How to do multiple arguments to map function where one remains the same in python?
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Sven MarnachSven Marnach
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Is Meyers' implementation of the Singleton pattern thread safe?
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In C++11, it is thread safe. According to the standard, §6.7 [stmt.dcl] p4:
If control enters
the declaration concurrently while the variable is being initialized, the concurrent execution shall wait for completion of the initialization.
GCC and VS support for the feature (Dynamic Initiali...
Is short-circuiting logical operators mandated? And evaluation order?
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4
Didn't know short-circuiting wouldn't apply to overloaded logic ops, that's intesting. Can you please add a reference to the standard, or a ...
How to round to 2 decimals with Python?
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489
You can use the round function, which takes as its first argument the number and the second ar...
GPU Emulator for CUDA programming without the hardware [closed]
...dependencies.
I've tried to get an emulator for BunsenLabs (Linux 3.16.0-4-686-pae #1 SMP
Debian 3.16.7-ckt20-1+deb8u4 (2016-02-29) i686 GNU/Linux).
I'll tell you what I've learnt.
nvcc used to have a -deviceemu option back in CUDA Toolkit 3.0
I downloaded CUDA Toolkit 3.0, installed it and ...
How to read data when some numbers contain commas as thousand separator?
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143
Not sure about how to have read.csv interpret it properly, but you can use gsub to replace "," ...
What is the difference between static_cast and C style casting?
... really hard to search for c style casts.
Another big benefit is that the 4 different C++ style casts express the intent of the programmer more clearly.
When writing C++ I'd pretty much always use the C++ ones over the the C style.
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Why doesn't a python dict.update() return the object?
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edited Sep 21 '09 at 14:21
answered Sep 21 '09 at 5:31
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