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The meaning of the shell variable $ #, $ @, $0, $1, $2 in linuxVariable description $ shell's PID (processID) $! Background ProcessID $? End code of the last command (Return Value) $-Flag list Set using the Set command $ * List of all parameters. For example, if "$ *" is enclosed by "$1 $2 $3... $ n", all parameters ar

Excerpted from: ABS_GUIDE : Http://www.tldp.org/LDP/abs/abs-guide.pdf In linux, shell variables $ #, $ @, $0, $1, $2 are interpreted as follows:Variable description:$Shell PID (ProcessID)$!PID of the background Process last run by Shell$?End code of the last command (return value)$-Flag overview Set by using the Set command$ *List of all parameters. For example, when "$ *" is included in... $ N "to

As mentioned in chapter 13th daemon (pp. 343-344) of advanced Unix programming, you can use the following method to enable/dev/null for daemon, make it have file descriptors 0, 1, and 2./* Close */For (I = 0; I {Close (I );}Fd0 = open ("/dev/null", o_rdonly );Fd1 = DUP (0 );Fd2 = DUP (

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

$# is the number of arguments passed to the script. $ is the name of the script itself. $ is the first parameter passed to the shell script, and the second argument that is passed to the shell script is [email protected] is a list of all the parameters passed to the script $* is to display all parameters passed to the script in a single string, unlike positional variables, which can be more than 9 $$ is the current process ID number for the script to run? is to display the exit status of the las

Transferred from: 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

Problem DescriptionWater problemInputEnter 2 dates, date by month date, month date by symbol-separated (topic contains multiple sets of data)OutputFind the number of days between these 2 dates (excluding itself), one row per group of test dataSample Input2011-1-12011-1-5Sample Output3HINTFor simplicity's sake, the assumption entered is 2 dates in the same month a

5). Overlapped I/O mode (overlapped)Common functions:1.WSASocket: Creating sockets2.TCPWSASendWSARecv3.UDP:WSASendToWSARecvFrom4.AccepEx (Mswsock.lib Library Export)WSAIoctl5. Data typeWsaoverlapped (wsaoverlapped)Function: WSAGetOverlappedResultuse:Buffer Objecttypedefstruct_buffer_obj{OVERLAPPED ol;//Overlapping structure Char*buff;buffers used by//Send/recv/acceptex intNlen;//The length of the buffPsocket_obj Psocket;///This I/O belongs to the set of section Word Objects intNoperatio

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

Linux variables #, @, 0, 1, 2, *, $, $? Linux VariablesLinux variables #, @, 2, *, $, $ Let's first write a simple script and then explain the meaning of each variable after execution # touch variable # vi variable script content is as follows :#! /Bin/shecho "number :#" Echo "scname: 0" Echo "first: 1" echo "second

Linux variables $ #, $ @, $0, $1, $2, $ *, $, $? # Touch variable # vi variable script content :#! /Bin/shecho "number: $ #" echo "scname: $0" echo "first: $1" echo "second: $2" echo "argume: $ @ "echo" show parm list: $ * "echo" show process id: $ "echo" show precomm stat: $? "Save and exit to grant the script executi

The front-end JS use XMLHttpRequest 2 upload pictures to the server, PC end and most mobile phones are normal, but in a small number of Android phone upload failed, the server to view the picture, displaying a byte count of 0. Here is the core code for uploading pictures: Html The code above uses Formdata to implement the form data submission. Formdata is a new type of data for XHR2 design that al

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.

Always think that int A [256] = {0}; Is to initialize all elements of a to 0, int A [256] = {1 }; is to initialize all elements of a to 1. when debugging, I found that the memory was not the same thing. I flipped through the C ++ programming language and finally made a conclusion. If the PDF file is not copied, it will be translated in this chapter. The following 5.2.1 array initialization array can be init

Endpoint 0 is the best way to test the driver, I will later put the Linux driver experience, this buddy wrote how to send data: http://www.lcsky.org/2.0/node/43 Control transmission is useful when a small amount of control information is exchanged, such as sending commands and obtaining the status of the lower computer. It is convenient to use control transmission through the cypress standard firmware framework, you only need to add your own processi

Length Decimal digits Identity Primary key FOREIGN key Allow empty Default value Description 1 Id Int 4 0 Is Is Whether Primary Key ID 2 NAME nvarchar 50

# Touch Variable # VI variable script content is 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 gives script Execute permission# chmod +x Variable Execute script #./variable aa bb number:2 scname:./va

The solution of ax^2+bx+c=0 equation is obtained by C language.#include #include #define M 0.000001int main (){float a,b,c,x,x2,n,q,p;scanf ("%f%f%f", a,b,c);N=b*b-4*a*c;if ((a{x= (-c)/b;printf ("%f", X);}else if ((n{x= (-B)/(2*A);printf ("%f", X);}else if (n>0){X= ((-B) +sqrt (n))/(

Linux shell ----- 1 variable $ #, $ @, $0, $1, $2 Description of the variable Description: $ Shell's PID (ProcessID) $! PID of the background Process last run by Shell $? End code of the last command (Return Value) $-Flag list Set using the Set command $ * List of all parameters. For example, when "$ *" is included in... $ N "to output all parameters. $ @ List of all parameters. For example, when "$ @" is i

"Ran out of trampolines of type 0/1/2" run-time errors usually occur when using a large number of recursive generics. To see this error you need to connect the device directly to the device to run debugging in order to see, you can imply that the AOT compiler allocates more type 0, type 1, or type 2 trampolines. In add