Tutorial by Examples: b

$ sleep 500 & [1] 7582 Puts the sleep command in background. 7582 is the process id of the background process.

$ jobs [1] Running sleep 500 & (wd: ~) [2]- Running sleep 600 & (wd: ~) [3]+ Running ./Fritzing & First field shows the job ids. The + and - sign that follows the job id for two jobs denote the default job and next candidate def...

$ fg %2 sleep 600 %2 specifies job no. 2. If fg is used without any arguments if brings the last process put in background to the foreground. $ fg %?sle sleep 500 ?sle refers to the baground process command containing "sle". If multiple background commands contain the string, it w...

$ bg [8]+ sleep 600 &

This tutorial will guide you through the process from scratch. Please note some preliminary notes about this particular setup, useful in case that you already have some requested package: Is needed a version of php >=5.0 (I had troubles with php 7.0) Is requested any version of perl Is need...

You can create and configure build types in the module-level build.gradle file inside the android {} block. android { ... defaultConfig {...} buildTypes { release { minifyEnabled true proguardFiles getDefaultProguar...

Usually this means that the Master crashed and that sync_binlog was OFF. The solution is to CHANGE MASTER to POS=0 of the next binlog file (see the Master) on the Slave. The cause: The Master sends replication items to the Slave before flushing to its binlog (when sync_binlog=OFF). If the Master cr...

1067 This is probably related to TIMESTAMP defaults, which have changed over time. See TIMESTAMP defaults in the Dates & Times page. (which does not exist yet) 1292/1366 DOUBLE/Integer Check for letters or other syntax errors. Check that the columns align; perhaps you think you are putting i...

An integer type whose value can be either true or false. bool is_even(int x) { return x%2 == 0; } const bool b = is_even(47); // false

There are a few common symbols in use: copyright sign ©, and trademark signs ® ™ fractions like ¼ superscripts. For instance, a shorthand for square meters is m².

By implementing Phalcon\Acl\RoleAware or Phalcon\Acl\ResourceAware you can use them as objects in Phalcon\Acl\Adapter\Memory::isAllowed(). // Create our class which will be used as roleName class UserRole implements Phalcon\Acl\RoleAware { protected $id; protected $roleName; publ...

Modifying the strings returned by the standard functions getenv(), strerror() and setlocale() is undefined. So, implementations may use static storage for these strings. The getenv() function, C11, §7.22.4.7, 4, says: The getenv function returns a pointer to a string associated with the matched...

To execute a function within a loop in node.js, it's fine to use a for loop for short loops. But the loop is long, using for loop will increase the time of processing which might cause the node process to hang. In such scenarios, you can use: asycn.times function recursiveAction(n, callback) { ...

The regsub command is used for regular expression matching and substitution. set mydata {The yellow dog has the blues.} # create a new string; only the first match is replaced. set newdata [regsub {(yellow|blue)} $mydata green] puts $newdata The green dog has the blues. # replace the data in t...

\m : Beginning of a word. \M : End of a word. \y : Word boundary. \Y : a point that is not a word boundary. \Z : matches end of data. Documentation: re_syntax

TestSubscribers allow you to avoid the work creating your own Subscriber or subscribe Action<?> to verify that certain values where delivered, how many there are, if the Observable completed, an exception was raised and a whole lot more. Getting Started This example just shows an assertion...

There are many examples where backticks are used inside a query but for many it's still unclear when or where to use backticks ``. Backticks are mainly used to prevent an error called "MySQL reserved word". When making a table in PHPmyAdmin you are sometimes faced with a warning or alert ...

A bit field is a variable that holds various boolean states as individual bits. A bit on would represent true, and off would be false. In the past bit fields were routinely used as they saved memory and reduced processing load. Though the need to use bit field is no longer so important they do offer...

Given the tab-separated file employee.txt 1 \t Arthur Dent 2 \t Marvin 3 \t Zaphod Beeblebrox $ mysql --user=user --password=password mycompany -e 'CREATE TABLE employee(id INT, name VARCHAR(100), PRIMARY KEY (id))' $ mysqlimport --user=user --password=password mycompany employee.txt ...

When accessing a non-static member of an object through a pointer to member, if the object does not actually contain the member denoted by the pointer, the behavior is undefined. (Such a pointer to member can be obtained through static_cast.) struct Base { int x; }; struct Derived : Base { int y; ...