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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

Init is one of the most indispensable programs in Linux system operation. Init process, which is a user-level process initiated by the kernel. The kernel will find it in several places in the past that used Init, and its correct location (for Linux systems) is/sbin/init. If the kernel cannot find Init, it will try to run/bin/sh, and if it fails, the boot of the system will fail.Linux 7 RunLevel (0: shutdown, shutdown mode,

I. The role of "#if 0/#if 1 ... #endif" 1 code is defined in a number of debug version codes, this time the code is completely ignored by the compiler. If you want code to take effect, just change #if 0 to #if 1. 2 #if 0 There i

This semester open algorithm class, feel very difficult, light this problem to get a long time, I here code is not my original code, is to learn from the online code according to their own understanding to improve, the original web address For http://www.cnblogs.com/qinyg/archive/2012/04/26/2471829.html Problem Description: Given the items in N and a backpack. The weight of the item I is WI, its value is VI, the capacity of the backpack is C. Ask how to choose the items to be loaded into the ba

] After the partition is created, the entire partition is formatted because the two partitions belong to one hard disk logically, mke2fs /dev/md0 Now you can take a look at/proc/mdstat md0 : active raid0 sda6[1] sda5[0] 1975680 blocks 64k chunks The Chunks here is the minimum data unit for disk read/write. The unit is K. The default value is 64 K.The default data

Posted on someone asked, from the terminal read into an integer n, random one input a 0 or 1Determine the maximum number of consecutive 0 or 1. Such as:Input00011110101 in continuous input, there are 4 times#coding: Utf-8"" Python Beijing Weekend training CourseHttps://github.com/pythonpeixun/article/blob/master/beijing_weekend.mdPython Shanghai Weekend CourseHtt

The RAND function requires a system-supplied seed to generate a sequence of pseudo-random numbers before generating a random number, and Rand produces a series of random numbers based on the value of the seed. If the seed provided by the system does not change, the sequence of pseudo-random numbers generated by each call to the RAND function is the same. Srand (unsigned seed) alters the seed value provided by the system through the parameter seed, which allows the sequence of pseudo-random numbe

2335:0-1 knapsack problemTime limit: 1 Sec Memory limit: 128 MB Submitted: 15 Settlement: 12 Topic Description A function of searching a subset space tree by backtracking method is designed. The parameters of the function include the necessary function of the nodal feasibility decision function and the upper bound function, and use this function to solve the

RAID types are illustrated below. In the following illustration, the following identifier is used: A, B, C, D, E, and F-represent data blocks. P1, p2, p3-indicates the parity information block RAID 0 RAID 0 features: At least two disks are required. Distribution of data entries No redundancy and optimal performance (no image or verification information

! ") - elifageMyage: - Print("Although I know I look very young, but you guessed wrong oh! ") the -Count+=1 - ifCount==4: -Continue_confirm=input ("you've run out of three chances! Are you trying again? y/n") + ifcountine_confirm=='y': -Count=1 + Else: A Print('It seems the game is over! But you seem to have lost! ')　　Through the above a simple sample, you can see his basic

What is a programming language?To give an example:If we do not speak English, and a foreigner who can not speak Chinese, how to do? Find a translator.Computers only know the machine language consisting of 0 and 1. Use 0 and 1 to tell the computer to work very tired, human language easy to understand, learning fast, hig

This article describes the PHP greedy algorithm to solve the 0-1 knapsack problem method. Share to everyone for your reference. The specific analysis is as follows: The greedy algorithm solves 0-1 knapsack problem, and the global optimal solution is obtained by local optimal solution. More flexible than dynamic planni

Os._exit () and Sys.exit ()Os._exit () vs Sys.exit ()OverviewPython's program has two exit methods: Os._exit (), Sys.exit (). This article describes the differences and choices between the two approaches.Os._exit () will terminate the Python program directly, and all subsequent code will not continue to execute.Sys.exit () throws an exception: Systemexit, if the exception is not captured, the Python interpreter exits. If there is code to catch this exception, the code will still execute. Catchin

Sqlite:cannot bind argument at index 1 because the index was out of range. The statement has 0 parameters There was this error in SQLite. 12-25 22:52:50.252: E/AndroidRuntime(813): Caused by: java.lang.IllegalArgumentException: Cannot bind argument at index 1 because the index is out of range. The statement has

What is RAID-0RAID-0 (isometric mode, stripe): Best performance. This model works better when it is made up of disks of the same size and capacity. This mode of RAID will first cut the disk out of the same amount of chunks (for example, 4KB), and then when a file to write to the raid, the file will be cut according to the size of the block, and then placed in each disk. Since each disk is interleaved with d

close SELinux->setenforce 0Set power on auto-off SelinxuMethod One:->vim/etc/selinux/configChange "selinux=enforcing" to "selinux=disalbed"->[ESC]: WqMethod Two:->sed-i ' s/selinux=enforcing/selinux=disalbed '/etc/selinux/config"Set CD on auto Mount"->echo "/dev/sr0/mnt iso9660 defaults 0 0" >>/etc/fatab#将系统镜像加载到 the/etc/fstab file"Configure Yum Source"Empty Yum Source->rm-rf/etc/yum.repos.d/*Configuring t

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

Scene Description:1 million data, data value between 0~65535, please use as little memory and fastest speed from small to large sortVoidsort (int* array, int n){The value of n is around 1 million.Your implementation}We first observed that all the data had been saved in array arrays, and what we need to do now is to sort the elements in the array. Now we extract t

relevant compilation. If both use the default parameter (that is, both are 0 values), when calling this function compile, the main use of the compiler characteristics indicated in the code to treat, if flags parameter setting has value, and dont_inherit There is no setting (that is, 0 values), then compiling the code is not only a compilation feature of the source works, but also flags dont_inheri

The process of doing a project often has a random selection process. This note mainly gives two methods of randomly generating n different random numbers, and then simply introduces the function Srand,rand and time used in the random numbers in C + +. In the end, a simple example is given, which is to randomly select K images from a folder containing n images to be stored in another folder.A: A method of generating n different random numbers#include II: Introduction to Srand,rand and time functi