Tutorial by Examples: v

This is a copy of the advanced function snippet from the Powershell ISE. Basically this is a template for many of the things you can use with advanced functions in Powershell. Key points to note: get-help integration - the beginning of the function contains a comment block that is set up to be ...

SELECT department, COUNT(*) AS "Man_Power" FROM employees GROUP BY department HAVING COUNT(*) >= 10; Using GROUP BY ... HAVING to filter aggregate records is analogous to using SELECT ... WHERE to filter individual records. You could also say HAVING Man_Power >= 10 since HAVIN...

1. Print the Hadoop version hadoop version 2. List the contents of the root directory in HDFS hadoop fs -ls / 3. Report the amount of space used and available on currently mounted filesystem hadoop fs -df hdfs:/ 4. Count the number of directories,files and bytes under the paths tha...

Example of calling an extension method as an extension and as a regular method. public Class MyClass Sub Main() 'Extension called directly on the object. Dim Version = Assembly.GetExecutingAssembly.GetVersionFromAssembly() 'Called as a regular method. ...

<plugin> <groupId>org.apache.tomcat.maven</groupId> <artifactId>tomcat7-maven-plugin</artifactId> <version>2.1</version> <executions> <execution> <...

com.google.gson library needs to be added to use this code. Here is the example string: String companyDetails = {"companyName":"abcd","address":"abcdefg"} JSON strings can be parsed using below syntax in Java: JsonParser parser = new JsonParser(); Json...

The word count program is like the "Hello World" program in MapReduce. Hadoop MapReduce is a software framework for easily writing applications which process vast amounts of data (multi-terabyte data-sets) in-parallel on large clusters (thousands of nodes) of commodity hardware in a relia...

To start the process: $ forever start index.js warn: --minUptime not set. Defaulting to: 1000ms warn: --spinSleepTime not set. Your script will exit if it does not stay up for at least 1000ms info: Forever processing file: index.js List running Forever instances: $ forever list i...

When adding a LIMIT to a UNION, this is the pattern to use: ( SELECT ... ORDER BY x LIMIT 10 ) UNION ( SELECT ... ORDER BY x LIMIT 10 ) ORDER BY x LIMIT 10 Since you cannot predict which SELECT(s) will the "10" will come from, you need to get 10 from each, then further whittle do...

All lines must be terminated with a line feed character (LF, ASCII value 10) and not for instance CR or CR+LF. There may be no trailing white space at the end of a line. The name of a source file must equal the name of the class it contains followed by the .java extension, even for fil...

One variable per declaration (and at most one declaration per line) Square brackets of arrays should be at the type (String[] args) and not on the variable (String args[]). Declare a local variable right before it is first used, and initialize it as close to the declaration as possible.

First, here's what can happen when text/template is used for HTML. Note Harry's FirstName property). package main import ( "fmt" "html/template" "os" ) type Person struct { FirstName string LastName string Street string Cit...

Once you have setup and configured the php5-fpm and wordpress settings you can configure the /etc/nginx/conf/nginx.conf file as below. You need to define the location blocks inside the server block and rewrite the url there as defined. server { listen 443 ssl; server_name abc.co.uk; ...

Fetching resources over the network is both slow and expensive: the download may require multiple roundtrips between the client and server, which delays processing and may block rendering of page content, and also incurs data costs for the visitor. All server responses should specify a caching p...

A condition variable is a primitive used in conjunction with a mutex to orchestrate communication between threads. While it is neither the exclusive or most efficient way to accomplish this, it can be among the simplest to those familiar with the pattern. One waits on a std::condition_variable with...

Passing a pointer argument to a T* parameter, if possible, is better than passing it to a const T* parameter. struct Base {}; struct Derived : Base {}; void f(Base* pb); void f(const Base* pb); void f(const Derived* pd); void f(bool b); Base b; f(&b); // f(Base*) is better than f(const...

An object pointer (including void*) or function pointer can be converted to an integer type using reinterpret_cast. This will only compile if the destination type is long enough. The result is implementation-defined and typically yields the numeric address of the byte in memory that the pointer poin...

Highcharts.setOptions({ lang: { loading: 'Načítavam...', months: ['Január', 'Február', 'Marec', 'Apríl', 'Máj', 'Jún', 'Júl', 'August', 'September', 'Október', 'November', 'December'], weekdays: ['Nedeľa', 'Pondelok', 'Utorok', 'Streda', 'Štvrtok', 'Piatok...

To view line numbers from Default view enter :set number To hide line numbers :set nonumber There is also a shortcut for above. nu is same as number. :set nonu To hide line numbers, we can also use :set nu!

int main (void) { const int foo_readonly = 10; int *foo_ptr; foo_ptr = (int *)&foo_readonly; /* (1) This casts away the const qualifier */ *foo_ptr = 20; /* This is undefined behavior */ return 0; } Quoting ISO/IEC 9899:201x, section 6.7.3 §2: If an attempt i...