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What's the difference between [ and [[ in Bash? [duplicate]
...and. It has several enhancements that make it a better choice if you write scripts that target bash. My favorites are:
It is a syntactical feature of the shell, so it has some special behavior that [ doesn't have. You no longer have to quote variables like mad because [[ handles empty strings and ...
Shell script to delete directories older than n days
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I was struggling to get this right using the scripts provided above and some other scripts especially when files and folder names had newline or spaces.
Finally stumbled on tmpreaper and it has been worked pretty well for us so far.
tmpreaper -t 5d ~/Downloads
tmpre...
JavaScript string encryption and decryption?
...use that will encrypt and decrypt information on the client side using JavaScript. The encrypted information will be stored in a database on a server, but never the decrypted version.
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Calling a function every 60 seconds
... call that within setTimeout because arguments.callee is deprecated in ecmascript 5.
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Highlight a word with jQuery
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Try highlight: JavaScript text highlighting jQuery plugin. ! Warning - The source code available on this page contains a crypto currency mining script, either use the code below or remove the mining script from the download on the website. !
/...
Drop data frame columns by name
...cars
colnames(dat)
# [1] "mpg" "cyl" "disp" "hp" "drat" "wt" "qsec" "vs" "am" "gear"
# [11] "carb"
dat[,c("mpg","cyl","wt")] <- list(NULL)
colnames(dat)
# [1] "disp" "hp" "drat" "qsec" "vs" "am" "gear" "carb"
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What REALLY happens when you don't free after malloc?
...stem once the process exits.
Source: Allocation and GC Myths (PostScript alert!)
Allocation Myth 4: Non-garbage-collected programs
should always deallocate all memory
they allocate.
The Truth: Omitted
deallocations in frequently executed
code cause growing leaks. They are
rarel...
What is the most efficient way to concatenate N arrays?
...s is very slow for arrays containing objects, see: jsperf.com/array-concat-vs-array-push-vs-array-spread/1
– hitautodestruct
Jun 11 at 6:06
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Get a list of all threads currently running in Java
...ernatives, but I've worked with other Java means of gathering stack traces vs just a list of threads. The performance impact seems to depend very strongly on which JVM you are using (JRockit vs Sun JVM for example). It's worth measuring in your specific instance. Whether or not it will affect you...
Resetting generator object in Python
... too many values, that can be unpractical.
So you have the classic memory vs. processing tradeoff. I can't imagine a way of rewinding the generator without either storing the values or calculating them again.
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