geode meaning

This article describes the meaning and settings of the Eclipse.ini parameter. Eclipse.ini has the following parameters:-vmargs-xms128m-xmx512m-xx:permsize=64m-xx:maxpermsize=128m Here are a few questions: 1. What each parameter means. 2. Why are there machines I set-XMX and-xx:maxpermsize to 512M after eclipse can be started, and some machines will not start. 　　3. Why write the above parameters to the Eclipse.ini file eclipse does not perform the c

Reprinted from: http://www.cnblogs.com/davygeek/p/5670212.htmlLearn to write a script today encountered some variables do not know, here do the next record. Variable Meaning $ File name of the current script $n Arguments passed to the script or function. N is a number that represents the first few parameters. For example, the first parameter is $ $, and the second argument is a $

1. Create a simple script variable:Vim variable2. Modify the contents as follows:#!/bin/SHEcho "number:$#"Echo "scname:$0"Echo "First : $"Echo "second:$2"Echo "Argume:[email protected]"Echo "Show Parm list:$*"Echo "Show Process id:$$"Echo "Show Precomm stat: $?"3. Execute the Script./variableThe meaning of some parameters in a Linux shell script: $# is the number of arguments passed to the script. The name of the script is the first parameter that is

please explain below The whole line of code in the Shell script that starts with if, have you seen the application scenario ?if (kill-0 $pid 2>/dev/du11) then echo "Oldboy" Else echo "Oldgirl" fiInterview question: Please explain the meaning of if (kill-0 $pid 2>/dev/null) code?if (kill-0 $pid 2>/dev/null) then echo "Oldboy" Else echo "Oldgirl" fiThe old boy answers the main points: kill-0 $pid 0 means not to send any signal to the PID correspon

Http://wenku.baidu.com/link?url=9Q9VU54XuvlN77urP1zwOLVMMrS2EFNx4HcvFizdPl-zQy3K_ Ipd3o-mdu4sbihezumnq0blbwhusuaol_y6quvkxtgjiaem9gq9i-jb5_e Shell in the condition to determine if in the-Z to-D meaning 2011-09-05 [-a file] if the file The existence is true. [-B file] True if file exists and is a block special file. [-C file] True if file exists and is a word special. [-D file] True if file exists and is a directory. [-E File] True if file exists. [-F

Original URL: http://dadekey.blog.51cto.com/107327/119938let's start by writing a simple script that will explain the meaning of each variable after execution .# Touch Variable# VI VariableThe script reads as follows:#!/bin/shecho "number:$#"echo "Scname:$0"echo "First: $ $"echo "Second:$2"echo "Argume:[email protected]"echo "Show Parm list:$*"echo "Show Process id:$$"echo "Show Precomm stat: $?"Save Exit assigning script Execution Permissions# chmod

files for each of the devices it can guide in this directory during the installation process. This means that you rarely need to create it yourself.As hardware moves out of the computer, the names become more blurred. Fortunately, today's high-grade software blocks on Linux use easy-to-understand names for history and hardware. For example, well, Pango (http://www.pango.org/) is one of them.If you are interested in these things, then I suggest you read the grand, but some of US English history-

@Test publicvoidtestcalendar () { calendarc=calendar.getinstance (); c.set (2000, NBSP;3,NBSP;13,NBSP;14,NBSP;15,NBSP;16); c.set (calendar.millisecond,123);// Random output NBSP;NBSP;NBSP;NBSP;SYSTEM.OUT.PRINTLN when not set (Formatutils.datetimestring (C.gettime ())); system.out.println (C.get (calendar.year) + " Input results 2000-04-13 14:15:162000316351310421421516123 Note: Calendar.day_of_week_in_month meaning: The month of 1-7 is the 1th week, 8

and profound, the whole such abbreviation is too professional, people are around dizzy. It is easier to understand from the English explanation or the Chinese full name.Pointer array: Array of pointers, which is used to store pointers to arrays, which are arrays of elements that are pointersArray pointer: A pointer to an array, which is a pointer to the arrayAlso note the differences in their usage, as illustrated below.int* a[4] Pointer array: The elements in array A are all int pointers (if t

#!/bin/bash#Created by Ley on 2014-11-14#Testing the Paramtersecho "The Compleate list is%s\n" "$$"echo "The Compleate list is%s\n" "$!"echo "The Compleate list is%s\n" "$?"echo "The Compleate list is%s\n" "$*"echo "The Compleate list is%s\n" "[Email protected]"echo "The Compleate list is%s\n" "$#"echo "The Compleate list is%s\n" "$ $"echo "The Compleate list is%s\n" "$"echo "The Compleate list is%s\n" "$ $"the meaning of shell variable $#,[email prot

Original URL: http://www.cnblogs.com/fhefh/archive/2011/04/15/2017613.htmlThe meaning of shell variable $#,[email protected],$0,$1,$2 in Linux is explained:Variable Description:$$The PID of the shell itself (ProcessID)$!PID of the Shell's last running background process$?End code of the last Run command (return value)$-Flag at a glance using the SET command$*All parameter lists. such as "$*" in the Case of "" ", in the form of" $ $ ... $n "output all

meaning. In the memory management of the operating system, there is a kind of important algorithm is the memory page replacement algorithm (including FIFO,LRU,LFU and so on several common page substitution algorithm). In fact, the core idea of the cache algorithm and the memory page replacement algorithm is the same: it is to design a principle to update and access the elements in a given space of limited size. The following is the core idea of the L

Linux Medium Variable $#,[email protected],$0,$1,$2,$*,$$,$? the meaningLet's start by writing a simple script that will explain the meaning of each variable after execution.The script reads as follows:[email protected] ~]# cat Test.txt#!/bin/bashecho "number:$#" echo "Scname:$0" echo "First:" echo "Second:$2" echo " Argume:[email protected] "echo" Show Parm list:$* "echo" Show Process id:$$ "echo" Show Precomm stat: $? "Save Exit Execute script[[Emai

The meaning of permissions (R, W, x) in Linux for directories and filesFirst, the significance of the permissions for the directory1, the first thing to understand is that the main content of the directory is to record the list of file names and sub-directories, rather than the place where the data is actually stored.2. R permissions: Having this permission means that the list of directory structures can be read, that is, you can view the file name an

each time the internal method is called, the method is preceded by self.Class MyClass:def __init__ (self):Passdef func1 (self):# do somethingPrint (' a ') #for exampleSelf.common_func ()def func2 (self):# do somethingSelf.common_func ()def common_func (self):PassThe meaning of self in Pythonwhen I first started to learn Python's class writing, I found it very troublesome, why we need to call when the definition is not needed, why not internal simplifi

Http://blog.sina.com.cn/s/blog_621f1e120100rj21.htmlThis is a very important part of JavaScript development, but many people feel that this is an elusive thing. To really understand the functional mechanisms of JavaScript, it is necessary to figure out what this is all about.Functions are called in different ways, this meaning is also different. There are seven ways to call functions in the JavaScript language:First: Call methodvar obj = {Method:funct

I'd like to use Ajax for all the usual code like this:But what is the meaning of void (0) here?In JavaScript, Void is an operator that specifies that an expression is evaluated but does not return a value.The void operator uses the following format:1. javascript:void (expression)2. Javascript:void expressionExpression is a standard of Javascript to evaluate. Parentheses on the outside of the expression are optional, but writing is a good habit. (Imple

the method, do not let the inheriting class change its meaning (do not allow subclasses to overwrite); allow the compiler to call this method as an inline method. Refer to the following example:public class test4{private final int li_int=0;Public final int Pub_fi_mod () {return li_int;}Protected final int pro_fi_mod () {return li_int;}Private final int pri_fi_mod () {return li_int;}private int Pri_mod () {return li_int;}}public class Test5 extends te

As a web front-end developer, accurate understanding of the meaning and compatibility of each CSS selector can be the first step in the advanced!CSS selectors can be divided into five categories: element selectors, relationship selectors, property selectors, pseudo-class selectors, and pseudo-object selectors.One, Element selectorThere are 4 element selectors:Second, the relationship selectorThere are 4 relationship selectors:Third, attribute selector

All options are optional and the following is a brief description of each option1.asyncThe default is true, which is the request for an asynchronous request, which is the meaning of Ajax presence. However, you can also set this parameter to False to implement a synchronous request. (The sync request will lock the browser until the request is complete before you can perform other actions)2.bforeSend (XHR)This method is used to modify the XMLHttpRequest