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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 "" ", in the form of" $ $ ... $n "output all parameters.[Email protected]A

Find the root of Equation ax^2+bx+c=0 # include "C language" to find the root of equation ax^2+bx+c=0

Java.lang.IllegalStateException:Couldn ' t read row 0, col 2 from Cursorwindow. Make sure the Cursor was initialized correctly before accessing data from it.Hint that the corresponding key field is not found, and that the field of the database is write-aligned and is case-sensitiveThis article is from the "Qing gan tea" blog, please be sure to keep this source http://shunshuncon.blog.51cto.com/8232441/16401

the form "$n".$#Number of arguments added to the shellThe file name of the shell itself$1~ $nEach parameter value added to the shell. $ $ is the 1th parameter, and the $ = is the 2nd parameter ....Example:1 #!/bin/bash2 #3 printf"The complete list is %s\n""$$"4 printf"The complete list is %s\n""$!"5 printf"The complete list is %s\n""$?"6 printf"The complete list is %s\n""$*"7 printf"The complete list is %s\n" "[emailprotected]"8 printf"The complete list is %s\n""$#"9 printf"The complete list is

816, 817 is a variety of HP Printer products standard cartridges, due to the adaptation of many models, the two cartridges are currently very popular. For many users, the use of original ink cartridges may not be the best choice, the use of ink cartridges are used to add ink is a very common choice, but after ink cartridge counter 0 is very critical. Here, the author for you to teach a few strokes hp 816, 817 ink cartridges clear Zero method.

Two arrays a [N], B [N], where each element value of A [N] is known, and B [I] is assigned a value, B [I] = a [0] * a [1] * a [2]… * A [N-1]/a [I] [Problem] 1. Division is not required. Two arrays a [N], B [N], where each element value of A [N] is known, and B [I] is assigned a value, B [I] = a [0] * a [1] * a [2]... *

' (length=45) requireBASEDIR. ' /‘.Str_replace(‘\\‘, ‘/‘,$class).‘. Php; }}common/object.php:phpnamespace Common; class Object { staticfunction Test () { echo__method__, ' ; }} // there must be no executable statement other than the object classapp/controller/home/index.php:phpnamespace app\controller\home; class index{ staticfunction Test () { echo__method__, ' ; }}When you run the Portal file index.php, app/controller/home/index.php and common/object

Learn about the basics of Android from 0 (2)-Explanation of the AndroidMainfest. xml fileAndroidMainfest. xml file details 1. About AndroidManifest. xml AndroidManifest. xml is a required file in every android program. It is located in the root directory of the entire project, describing components exposed in the package (activities, services, and so on), their respective implementation classes, various dat

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 (

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

1. alpha is used to set transparency. Its basic attributes are filter: alpha (opacity, finishopacity, style, startX, startY, finishX, finishY ).Opacity indicates the transparency level. The value 0-100 indicates that the opacity is completely transparent, and the value indicates that the opacity is not transparent.Finishopacity is used to set the transparency at the end to achieve the gradient effect. The value range is also

("---------------------------------------------"); Printf ("input command to test the program "); Printf ("I or I: Input n to test "); Printf ("G or G: Get n to enable F (n) = N "); Printf ("Q or Q: Quit "); Printf ("---------------------------------------------"); Printf ("$ input command> "); } Void main () ...{ Char sinput [10]; Int N; Show_menu (); Scanf ("% s", sinput ); While (stricmp (sinput, "Q ")! = 0) ...{ Int T =

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"

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 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

#!/usr/bin/env Python#-*-Coding:encoding-*-# Prompt for user name and password# Verify user name and password# If an error occurs, the output user name or password is incorrect# If successful, the output is welcome, xxx!Import GetpassName = input (' Please enter user name: ')PWD =getpass.getpass (' Input your password ')Print (PWD)If name = = "Alex" and pwd = = "cmd": Print ("Welcome, alex! ")Else Print (' User name or password output error! ‘)Python Basics

1110:0 Starting point algorithm 17--comparison 2 number size time limit:1 Sec Memory limit:64 MB 64bit IO Format:%lldsubmitted:3272 accepted:1639[Submit] [Status] [Web Board] DescriptionEnter 2 integers, according to the output from large to smallInput2 integers N and m (multiple sets of test data)OutputIn the middle of the output from large to small, se