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What is the meaning of variable $#,$@,$0,$1,$2,$*,$$,$ in Linux?

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

What is the power 0 of 10?

Author: idleTime:Blog: blog.csdn.net/cg_ IEmail: B _dx@sohu.comReference books: programmer's mathematics What is the power 0 of 10?Reference:In the 10-digit explanation, we have mentioned that "1 is 100 (10 to the power of 0)", that is

What is the array subscript starting from 0?

We will feel that the array subscript starting from 0 very annoying, subscript 0 began to represent the first, subscript 1 is the second, is not feel particularly awkward. So why is it starting at 0? Int[] A=new int[]{1,2,3,4,5};

[0] Introduction: What is an algorithm? How to find a stable marriage match?

ease of analysis, we will make some conventions below. We numbered male with letters A, B, and C, and female with numbers 1, 2, and 3. We put all men on the left from top to bottom, and the numbers in parentheses indicate the ranking of all women in each person's mind. Then, we put all women on the right, the letters in brackets indicate their preferences for men. Figure 0-1 shows a situation where two men

What is the meaning of variable $#,$@,$0,$1,$2,$*,$$,$ in Linux?

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 Pre

WinXP setting virtual memory to 0 is a viable need to pay attention to what

Setting the virtual memory to 0 is, of course, feasible, and when the user sets the system to no paging file, virtual memory is displayed as 0, but after the reboot takes effect, we can see that each program will still occupy a bit of virtual memory, not completely banned, and if the virtual memory

does {} while (0) what is the use of

has always been a relatively simple method: int foo () { somestruct* ptr = malloc (...); DoSomething ...; if (Error) { goto END; } DoSomething ...; if (Error) { goto END; } DoSomething ...; END: Free (PTR); return 0; } Because Goto does not conform to the structure of software engineering, and it is possible to make the code diffi

What is the use of time-time ()-date ('Z? Why is the value of date ('Z') 0?

Quot; *** obtain the timestamp of the current Greenwich Mean time ** @ returninteger * functiongmtime () {return (time () time phpdatetime time zone /*** Obtain the timestamp of the current Greenwich Mean time ** @ return integer */function gmtime () {return (time ()-date ('Z '));} The function is used to obtain the timestamp of the current Greenwich Mean Time.Why is the output value of echo date ('

The ubiquitous principle [0]: What is the principle?

to distinguish between importance and secondary importance. This is a methodology issue. I have written several posts related to this, such as "how to choose it technology books" and "Do the right thing ", later, I will continue to write related posts (some of which are included in this series), hoping to help everyone.Finally, to give everyone a better impression, let's take a look at Steve Jobs's famous saying:Every day, I look into the mirror and

What is MPEG-4 Simple Profile level 0?

In MPEG-4 14496-2, there is no definition of Simple Profile level 0, the smallest is simple profile Level 1, so what is simple profile level 0? As follows: I have heard of a level 0

What is the value of C # I=0;i=i++,i?

-level arithmetic of the expression is processed, but I is involved in the operation, and at this time I is assigned to I. Finally, release the variables created by the system, such as I '. Then there is an upgrade version of the processing of ++i, and i++ exactly the opposite, the system will first give I self-inc

What if libexpat. so.0 is not found?

What should I do if I cannot find libexpat. so.0 and ImportErrorlibexpat. so.0 appear. In Linux, the file is moved to the lib directory instead of/usr/lib, and the name has been changed to libexpat. so.1. This is also a link. View its properties. in my system, we will find t

C # I = 0; I = I ++, what is the value of I ?,

C # I = 0; I = I ++, what is the value of I ?, Yesterday I watched the dalao chat in the group. Someone asked this question. This question should be quite common Int I = 0, t; For (t = 0; t { I = I ++; Console. WriteLine (I ); } Daxie said that for

C # I = 0; I = I ++, what is the value of I ?,

C # I = 0; I = I ++, what is the value of I ?, Reference page: Http://www.yuanjiaocheng.net/entity/update-entity.html Http://www.yuanjiaocheng.net/entity/delete-entity.html Http://www.yuanjiaocheng.net/entity/add-entity-graph.html Http://www.yuanjiaocheng.net/entity/update-entity-graph.html Http://www.yuanjiaocheng.net/ASPNET-CORE/first.html Yesterday I watched t

Functional Programming (0)-What is functional programming

internal component function input output, the desired result is produced (much like the deformation process of the input object). Inputs each pass through a component function, the state of the program will undergo some changes, the whole process is actually the state of the program of the deformation (transformation). So, can it be said that instruction programming corresponds to variable assignment, func

What is the difference between "javascript:;" and "javascript:void (0)"?

The VOID operator evaluates the given expression and returns directly to the undefined The void operator is usually used only to get The original value of the undefined, typically using void (0)(equivalent to void 0). In the above case, you can also use the global variable undefined instead (assuming it is still the

What is the meaning of the jQuery object [0? _ Jquery

S [0] What is the bottom? (S is a jQuery object) code: Var s = $ ("p "); Alert (s. length ); Alert (s [0]); JQuery objects all have a 0 index by default, S is the jQuery object

What is the meaning of variable $#,$@,$0,$1,$2,$*,$$,$ in Linux?

for these things, the gods are already in the chest, but there are some just contact Linux , Unix people like these systems may not be familiar with these variables, so I'll share them with you today. What problem can add QQ Group, we discuss together -- Ops tribe:348384728To make it easier for everyone to understand, write a simple script that will explain the meaning of each variable later.# Touch Test# VI TestThe script reads as follows: #!/bin/sh

What is kill-0 pid used for?

http://blog.csdn.net/pecywang/article/details/8558968 Group of colleagues talking about kill-0, talents, do not know what to do, look up the Internet, the special record as follows The kill-0 PID does not send any signals, but the system will check for errors.So it is often used to check whether a process exists, e

What will happen when so_sndbuf is set to 0?

A piece of http://www.csdn.net/Develop/Read_Article.asp in the chiway translation? Id = 15224 An application disables the buffer by setting so_sndbuf to 0, and then sends a blocking send () call. In this case, the system kernel locks the buffer of the application until the receiver confirms that it has received the entire buffer before sending () calls are returned. It seems that this is a simple method to

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