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let'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 Exitassigning script Execution Permissions# chmod +x variableEx

Learning node (2) from 0 to 1 and building an http server During the course of the previous section, we learned about the connection and differences between different module specifications. In this section, we officially started learning about node. First, we started from setting up an http server and running simple programs.1. hello world Classichello world. First, createserver.jsTo save our code: consol

$ file name and path$1,$2 parameter 1, parameter 2$# The number of arguments passed to the script or function $$ current shell process ID $? judge execution succeeded or not 0 for success [email protected] Pass all parameters of a script or function$* Pass all parameters of a script or function${}Note: [Email protected] and the $* 's All P

Variable Description:$$ Shell自己PID（ProcessID） $! Shell背景上次执行Process的PID $? 命令的结束代码（返回值） $- 使用Set命令设定的Flag一览 $* 全部參数列表。如"$*"用「"」括起来的情况、以"$1 $2 … $n"的形式输出全部參数。 [emailprotected] 全部參数列表。如"[emailprotected]"用「"」括起来的情况、以"$1" "$2" … "$n" 的形式输出全部參数。 $# 加入到Shell的參数个数 $0 Shell本身的文件名称 $1～$n Demo Sample:#!/bin

Tags: file run BSP case background POS linux lis Linux The 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 ""

The selector selecor in jQuery is a powerful feature that is frequently used. In fact, jQuery provides us with a wealth of techniques to use selector to locate DOM elements. The following describes how to select all elements of a selector instance * $ ( amp; quot; * amp; quot ...,. The selector selecor in jQuery is a powerful feature that is frequently used. In fact, jQuery provides us with a wealth of techniques to use selector to locate DOM elements. The following describes the usage Selecto

resourcesdirectory to find “himi.png ". Therefore, we usually open the HD retina in the applicationdidfinishlaunching function of appdelegate. cpp and add the following code: Targetplatform target = gettargetplatform (); // obtain the current device typeIf (target = ktargetipad) {// if it is an iPadIf (pdirector-> enableretinadisplay (true) {// If HD retina is enabledCcfileutils: sharedfileutils ()-> setresourcedirectory ("../ipadhd ");} Else {Ccfileutils: sharedfileutils ()-> setresourced

Using Newton's Iterative method to find the root of the following equation near 1.5:2x^3-4x^2+3x-6=0 As for the Newton iterative method, in the course of computational methods, the basic formula is: xn+1=xn-f (Xn)/F *(Xn) xn+1 is the n+1 iteration result,Xn is the nth iteration result,f * ( Xn) is the Guide function value of f (Xn) . Basic steps: The first step is to rewrite the equation as polynomial f (

Http://dadekey.blog.51cto.com/107327/119938 Let's first write a simple script and then explain the meaning of each variable. # Touch variable # Vi variable The script content is as follows: #! /Bin/sh Echo "number: $ #"Echo "scname: $0"Echo "First: $1"Echo "Second: $2"Echo "argume: $ @" Save and exit Grant the script execution permission # Chmod + x variable Execut

Let's first write a simple script and then explain the meaning of each variable. # Touch variable # Vi variable The script content is as follows: #! /Bin/sh Echo "number: $ #"Echo "scname: $0"Echo "First: $1"Echo "Second: $2"Echo "argume: $ @" Save and exit Grant the script execution permission # Chmod + x variable Execute scripts #./Variable AA bb Number: 2Scname:./variableFirst: AASec

printf "The complete list is%s\n" "$$" 24520 the shell itself PIDprintf "The complete list is%s\n" "$!" PID of the last running background process of the empty shellprintf "The complete list is%s\n" "$?" 0 end code of the last Run command (return value)printf "The complete list is%s\n" "$*" 123 all parameters List of QQ. such as "$*" in the Case of "" ", in the form of" $ $ ... $n "output all parameters.printf "The complete list is%s\n" "[email protec

The 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 "$*" in the Case of "" ","$ $ ... $n"All parameters in the form of output.[email protected]All

Shell variables in Linux $#, [e-mail protected],$0,$1,$2 meaning explanation:Variable Description: $$ the shell itself PID (ProcessID) $! What is the PID of the Shell's last running background process? End code of the last Run command (return value) $-flag with SET command list $*all parameter lists. As"$*"With""In the case of"$ $ ... $n"all parameters in the form of output. [email protected] all parameter

$$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 parameters.[Email protected]All parameter lists. such as "[email protected]" with "" "in the case, with" $ "" $ "... All parameters are output in the form "$n".$#Number of arguments added to the shell$The name of the shell

I feel that my understanding of Linux has not been enough, so I recently turned to a "bird brother's Linux private dishes." This is a basic book, lofty high-rise floor, will not much but can learn. This is a few of my knowledge points, although very basic. Hope to share with you. Chapter 0 Computer Overview1, the computer has three major parts:A. input section, including keyboard, mouse ... B. Central processing Unit (CPU): Logic, control, memory an

think the former effect is closer to the example, but this is certainly not the way to add CSS to the problem caused by different. In order to write this summary open double screen, unexpectedly found that the previous copy of the window size compatibility better, the latter part of the form has been completely deformed. This question is mentioned in "Mastering CSS," and if there is time, I will summarize how to make the Web page compatible with the window.(1) Examples of using style elementsSo

friends punctuate praise bubbling; The paper refused, and then refused, three refused, refused to my upset, discouraged, but I still want to treat him as first love; Like a mushroom cool, lack of courage and confidence, silly miss, regret; (It seems that the two are rather sad ...) Other unexpected) Next year expect: Whether it is a technical book, or other types of books, you should read a lot; Develop a good habit of early to bed and early to eat break

Label: C math. h The remainder function and % operator. The following code cannot be compiled (GCC) # Include Operator % can only operate on Integer Data (guess, % is implemented based on data bit shift ). Here, the remainder of the floating point number is called fmod (Doube X, Double Y) in Double X = 10, y = 0; y = x % 2; is this expression correct?

#include 　　Data structure on the machine "to create a two-fork tree, and the first post-order traversal, output tree height, the number of degrees is 0 1 2 nodes"