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Really Cheap Command-Line Option Parsing in Ruby
... is that you'll get a warning (if you've enabled them) when accessing an unset global variable, but it's still falsey, so it works just fine for throwaway tools and quick scripts.
One caveat pointed out by FelipeC in the comments in "How to do really cheap command-line option parsing in Ruby", is t...
How can I validate a string to only allow alphanumeric characters in it?
... I think this answer is just plain wrong, assuming alphanumeric set is A-Z,a-z and 0-9 because this covers the whole range of Unicode letters and digits, which including non-Latin characters as well. For example, char.IsLetterOrDigit('ก') will return true. csharppad.com/gist/f96a6062f9f...
What does the unary plus operator do?
What does the unary plus operator do? There are several definitions that I have found ( here and here ) but I still have no idea what it would be used for. It seems like it doesn't do anything but there has be a reason for it, right?
...
Get final URL after curl is redirected
I need to get the final URL after a page redirect preferably with curl or wget.
10 Answers
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Node / Express: EADDRINUSE, Address already in use - Kill server
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process.on('exit', ..) isn't called if the process crashes or is killed. It is only called when the event loop ends, and since server.close() sort of ends the event loop (it still has to wait for currently running stacks here and there) it makes no sense to put ...
Multiple line code example in Javadoc comment
...ties issues (in particular with Generics), e.g.:
* <pre>
* {@code
* Set<String> s;
* System.out.println(s);
* }
* </pre>
Will give correct HTML output:
Set<String> s;
System.out.println(s);
While omitting the @code block (or using a <code> tag) will result in HTML...
How to debug a bash script? [closed]
...ing within the script. In that case, as Cheeto reminded me, you can use:
set -x
This turns debugging on. You can then turn it off again with:
set +x
(You can find out the current tracing state by analyzing $-, the current flags, for x.)
Also, shells generally provide options '-n' for 'no ex...
PostgreSQL: Modify OWNER on all tables simultaneously in PostgreSQL
How do I modify the owner of all tables in a PostgreSQL database?
20 Answers
20
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How can I get the external SD card path for Android 4.0+?
...
I have a variation on a solution I found here
public static HashSet<String> getExternalMounts() {
final HashSet<String> out = new HashSet<String>();
String reg = "(?i).*vold.*(vfat|ntfs|exfat|fat32|ext3|ext4).*rw.*";
String s = "";
try {
final Pro...
How can you use an object's property in a double-quoted string?
...ons of the elements (by default; a different separator can be specified by setting $OFS) E.g., "array: $(@(1, 2, 3))" yields array: 1 2 3
Instances of any other type (including elements of collections that aren't themselves collections) are stringified by either calling the IFormattable.ToString() m...