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Test whether a glob has any matches in bash
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Bash specific solution:
compgen -G "<glob-pattern>"
Escape the pattern or it'll get pre-expanded into matches.
Exit status is:
1 for no-match,
0 for 'one or more matches'
stdout is a list of files matching t...
Accessing members of items in a JSONArray with Java
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Have you tried using JSONArray.getJSONObject(int), and JSONArray.length() to create your for-loop:
for (int i = 0; i < recs.length(); ++i) {
JSONObject rec = recs.getJSONObject(i);
int id = rec.getInt("id");
String loc = rec.getString("loc");
/...
How to round a number to significant figures in Python
I need to round a float to be displayed in a UI. E.g, to one significant figure:
20 Answers
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Adding HTML entities using CSS content
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You have to use the escaped unicode :
Like
.breadcrumbs a:before {
content: '\0000a0';
}
More info on : http://www.evotech.net/blog/2007/04/named-html-entities-in-numeric-order/
share
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How to use NSURLConnection to connect with SSL for an untrusted cert?
I have the following simple code to connect to a SSL webpage
13 Answers
13
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What is the cleanest way to ssh and run multiple commands in Bash?
... have an ssh agent set up, and I can run commands on an external server in Bash script doing stuff like:
12 Answers
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What text editor is available in Heroku bash shell? [closed]
I'm trying to update httpd.conf in my Cedar-based Heroku app. I got to my Heroku bash with
15 Answers
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@try - catch block in Objective-C
Why doesn't @try block work?
It crashed the app, but it was supposed to be caught by the @try block.
3 Answers
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Determine the data types of a data frame's columns
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Your best bet to start is to use ?str(). To explore some examples, let's make some data:
set.seed(3221) # this makes the example exactly reproducible
my.data <- data.frame(y=rnorm(5),
x1=c(1:5),
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Writing files in Node.js
I've been trying to find a way to write to a file when using Node.js, but with no success. How can I do that?
19 Answers
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