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How to ignore xargs commands if stdin input is empty?
...s /empty_dir/ | xargs -i cp {} {}.bak # every {} is replaced with the args from one input line
ls /empty_dir/ | xargs -I ARG cp ARG ARG.bak # like -i, with a user-specified placeholder
Keep in mind that xargs splits the line at whitespace but quoting and escaping are available; RTFM for details.
...
Spring Expression Language (SpEL) with @Value: dollar vs. hash ($ vs. #)
....com/javaee/5/tutorial/doc/bnahq.html which served as a template for SpEL. From the Spring docu: "The Spring Expression Language (SpEL for short) is a powerful expression language that supports querying and manipulating an object graph at runtime. The language syntax is similar to Unified EL but off...
Is there an ExecutorService that uses the current thread?
...mind you) implementation that only uses the current thread. Stealing this from "Java Concurrency in Practice" (essential reading).
public class CurrentThreadExecutor implements Executor {
public void execute(Runnable r) {
r.run();
}
}
ExecutorService is a more elaborate interface...
vertical alignment of text element in SVG
...ideographic | alphabetic | hanging | mathematical |
inherit
Description from w3c
This property specifies how an object is aligned with respect to its
parent. This property specifies which baseline of this element is to
be aligned with the corresponding baseline of the parent. For example,...
Why does CSS work with fake elements?
...
YADA (yet another (different) answer)
Edit: Please see the comment from BoltClock below regarding type vs tag vs element. I usually don't worry about semantics but his comment is very appropriate and informative.
Although there are already a bunch of good replies, you indicated that your p...
Java ArrayList - how can I tell if two lists are equal, order not mattering?
...clear reasons why not.
There are a few answers here which suggest methods from CollectionUtils in the Apache Commons Collections library but none has spotted the most beautiful, elegant way of answering this question:
Collection<Object> culprits = CollectionUtils.disjunction( list1, list2 );...
What makes JNI calls slow?
... making its own calls to the JVM. Accessing Java fields, methods and types from the native code requires something similar to reflection. Signatures are specified in strings and queried from the JVM. This is both slow and error-prone.
Java Strings are objects, have length and are encoded. Accessing ...
Safely limiting Ansible playbooks to a single machine?
...local"
If {{ target }} isn't defined, the playbook does nothing. A group from the hosts file can also be passed through if need be. Overall, this seems like a much safer way to construct a potentially destructive playbook.
Playbook targeting a single host:
$ ansible-playbook user.yml --extra-var...
String to LocalDate
...
You may have to go from DateTime to LocalDate.
Using Joda Time:
DateTimeFormatter FORMATTER = DateTimeFormat.forPattern("yyyy-MMM-dd");
DateTime dateTime = FORMATTER.parseDateTime("2005-nov-12");
LocalDate localDate = dateTime.toLocalDate();
...
what is difference between success and .done() method of $.ajax
...
In short, decoupling success callback function from the ajax function so later you can add your own handlers without modifying the original code (observer pattern).
Please find more detailed information from here: https://stackoverflow.com/a/14754681/1049184
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