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Read user input inside a loop
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107
Read from the controlling terminal device:
read input </dev/tty
more info: http://compgro...
Regular Expression for alphanumeric and underscores
...ng that contains only those characters (or an empty string), try
"^[a-zA-Z0-9_]*$"
This works for .NET regular expressions, and probably a lot of other languages as well.
Breaking it down:
^ : start of string
[ : beginning of character group
a-z : any lowercase letter
A-Z : any uppercase letter...
What are 'get' and 'set' in Swift?
...et someVar = myTriangle.perimeter
... Which calls this:
get{
return 3.0 * self.sideLength
}
And thus it's essentially like if the calling controller did this:
let someVar = 3.0 * myTriangle.sideLength
When you set the variable from another object, it looks like this:
myTriangle.perimeter = 1...
Java: using switch statement with enum under subclass
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answered Apr 15 '12 at 11:05
darrengormandarrengorman
10.5k22 gold badges2020 silver badges2424 bronze badges
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Basic HTTP and Bearer Token Authentication
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answered Mar 21 '14 at 17:04
Sabuj HassanSabuj Hassan
33.9k1010 gold badges6464 silver badges7575 bronze badges
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Installing older version of R package
...geurl <- "http://cran.r-project.org/src/contrib/Archive/ggplot2/ggplot2_0.9.1.tar.gz"
install.packages(packageurl, repos=NULL, type="source")
If this doesn't work for you and you're on Windows, the reason is probably the lack of an appropriate tool chain for building/compiling packages. Normall...
Tell Ruby Program to Wait some amount of time
...en longer...
sleep(2.hours); sleep(3.days) # etc., etc.
# or shorter
sleep(0.5) # half a second
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send Content-Type: application/json post with node.js
... (error, response, body) {
if (!error && response.statusCode == 200) {
console.log(body.id) // Print the shortened url.
}
});
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f...
Command to get time in milliseconds
...umber of seconds + current nanoseconds.
Therefore, echo $(($(date +%s%N)/1000000)) is what you need.
Example:
$ echo $(($(date +%s%N)/1000000))
1535546718115
date +%s returns the number of seconds since the epoch, if that's useful.
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Modulo operation with negative numbers
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edited Nov 24 '16 at 10:41
answered Jul 30 '12 at 11:43
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