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How to search and replace text in a file?
...do this yourself instead. Redirecting sys.stdout isn't a great idea, especially if you're doing it without a try..finally like fileinput does. If an exception gets raised, your stdout might never get restored.
– craigds
Dec 18 '14 at 3:09
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What's up with Java's “%n” in printf?
...e that you need \u000A linefeed character, for example in networking.
In all other situations use %n
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Ignoring directories in Git repositories on Windows
...doublequotes, so for example ".gitignore" and it saves it without automatically adding an extension.
– Arrowmaster
Feb 10 '11 at 17:44
9
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MySQL Query - Records between Today and Last 30 Days
I want to return all records that were added to the database within the last 30 days. I need to convert the date to mm/dd/yy because of display purposes.
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Is it possible to have empty RequestParam values use the defaultValue?
... the @RequestParam type to an Integer and make it not required. This would allow your request to succeed, but it would then be null. You could explicitly set it to your default value in the controller method:
@RequestMapping(value = "/test", method = RequestMethod.POST)
@ResponseBody
public void te...
keep rsync from removing unfinished source files
...nt to move the files from speed to mass after they're done downloading. Ideally, I'd just run:
4 Answers
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Crontab Day of the Week syntax
...day
5 - Fri Friday
6 - Sat Saturday
7 - Sun Sunday
Graphically:
┌────────── minute (0 - 59)
│ ┌──────── hour (0 - 23)
│ │ ┌────── day of month (1 - 31)
│ │ │ ┌──── month (1 - 12)
│ │ │ │ ┌─...
How should I ethically approach user password storage for later plaintext retrieval?
...hat the user can retrieve the password, then strictly speaking you don't really need to retrieve the password they set (they don't remember what it is anyway), you need to be able to give them a password they can use.
Think about it: if the user needs to retrieve the password, it's because they've...
Select multiple columns in data.table by their numeric indices
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For versions of data.table >= 1.9.8, the following all just work:
library(data.table)
dt <- data.table(a = 1, b = 2, c = 3)
# select single column by index
dt[, 2]
# b
# 1: 2
# select multiple columns by index
dt[, 2:3]
# b c
# 1: 2 3
# select single column by na...
R object identification
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I usually start out with some combination of:
typeof(obj)
class(obj)
sapply(obj, class)
sapply(obj, attributes)
attributes(obj)
names(obj)
as appropriate based on what's revealed. For example, try with:
obj <- data.frame(a...