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What is the $? (dollar question mark) variable in shell scripting? [duplicate]
...), you will get the return value thrown by the ls command, which should be 0 (default "success" return value). If it doesn't exist, you should get a number other then 0. The exact number depends on the program.
For many programs you can find the numbers and their meaning in the corresponding man pa...
Understanding the transclude option of directive definition?
...
Prashant Pokhriyal
2,80944 gold badges2222 silver badges2828 bronze badges
answered Mar 8 '13 at 16:24
odiseoodiseo
...
ZeroMQ的学习和研究（PHP代码实例） - C/C++ - 清泛网 - 专注C/C++及内核技术
...息通信。几年的竞争下来，Apache 基金会旗下的符合 AMQP/1.0标准的 RabbitMQ 已经得到了广泛的认可，成为领先的 MQ 项目。
与 RabbitMQ 相比，ZMQ 并不像是一个传统意义上的消息队列服务器，事实上，它也根本不是一个服务器，它更...
Error handling principles for Node.js + Express.js applications?
...t(err);
});
Middleware syntax is valid in a get request.
As for D)
(07:26:37 PM) tjholowaychuk: app.error is removed in 3.x
TJ just confirmed that app.error is deprecated in favor of E
E)
app.use(function(err, req, res, next) {
// Only handle `next(err)` calls
});
Any middleware that ...
Comparing two NumPy arrays for equality, element-wise
...
402
(A==B).all()
test if all values of array (A==B) are True.
Note: maybe you also want to test ...
Are parallel calls to send/recv on the same socket valid?
...
Robert Harvey
164k4141 gold badges308308 silver badges467467 bronze badges
answered Dec 30 '09 at 17:46
Chris DoddChris Dodd
...
How to gracefully handle the SIGKILL signal in Java
...logoff or system shutdown.
I tried the following test program on OSX 10.6.3 and on kill -9 it did NOT run the shutdown hook, as expected. On a kill -15 it DOES run the shutdown hook every time.
public class TestShutdownHook
{
public static void main(String[] args) throws InterruptedExcepti...
SQL UPDATE all values in a field with appended string CONCAT not working
... linda |
| 3 | sam |
| 4 | henry |
+------+-------+
4 rows in set (0.02 sec)
mysql> update t set data=concat(data, 'a');
Query OK, 4 rows affected (0.01 sec)
Rows matched: 4 Changed: 4 Warnings: 0
mysql> select * from t;
+------+--------+
| id | data |
+------+--------+
| 1 ...
Reuse Cucumber steps
...
102
UPDATE: The method described below has been deprecated. The recommended way to call a step from...
How can you find the height of text on an HTML canvas?
... var block = $('<div style="display: inline-block; width: 1px; height: 0px;"></div>');
var div = $('<div></div>');
div.append(text, block);
var body = $('body');
body.append(div);
try {
var result = {};
block.css({ verticalAlign: 'baseline' });
res...