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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

Newton's Iterative method was used to find the root of the equation near 1.5:2x^3-4x^2+3x-6=0.Solution: Newton's Iterative method is also called Newton tangent method. Setf =2x^3-4x^2+3x-6,F1 is the derivative of the equation, thef1 = 6x^2-8x+3, and f1= (f (x0) -0)/(X0-X1),

): - ifSelf.is_empty: - RaiseQueueemptyexception ('error:trying to dequeue element from an empty queue') AFront =Self.queue[0] +Self.queue = self.queue[1:] the returnFront - $ defClear (self): theSelf.queue = [] the the the defTest (queue): - Print('\ninit Queue:') inQueue.init ([1, 2, 3, 4, 5, 6, 7]) the queue.show () the About Print('\nenqueue element to queue:'

CentOS startup level: init 0, 1, 2, 3, 4, 5, 6 This is a long-time knowledge point, but I have been confused all the time. Today I am trying to understand it .. 0: stopped 1: Maintenance by root only 2: multiple users, cannot use net file system 3: more users 5: Graphical 4: Security Mode 6: restart In fact, you can v

# 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))/(

Document directory 0: stopped 0: downtime 1: single-user mode, only root for Maintenance 2: multi-user, cannot use net file system3: full multi-user 5: Graphical 4: security mode 6: restart actually, you can view/etc/rc. rc * in d *. d .. Init 0, the corresponding system will run, the program specified in/etc/rc. d/

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

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

[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]... * A [N-1]/A [I]; requirements: 1. Division operations are not allowed. 2. Except for the cyclic Count value, a [n], B [N], no other variables (including local variables and global variables)

"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

In Linux, shell variables $ #, $ @, $0, $1, $2 are interpreted as follows: Variable description: $ PID (ProcessID) of Shell itself $! 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, w

Error:1>vtkcommon.lib (vtkdebugleaksmanager.obj): Error LNK2038: "_iterator_debug_level" mismatch detected: value "0" does not match value "2" ( cloudviewer.obj) error reason :Debug uses the release library file.even if you add two in the library, but the release library file is placed in front of debug, also error, by default in order to use the library file. Similar error : Release under the use of DEBUG

Netease sports news in England on March 29, Beijing time in the early morning, the Champions League 1/4 finals began the first round of competition. Arsenal beat Juventus 2 to 0 at home. Both Fabregas and Henry beat each other and helped each other. A yellow card will be given to viveri, who will return to haibury, and will miss the second round. At the last moment of the game, cammoraneisi and zebian were

1. Construct a two-level directory with 0 to 90 numbers, each with a 2-digit name such as 00/79 and print out all the directories? Reply to discussion (solution) #结果: Array ([0] = + [1] = [2] = [3] = [4] = [5] = [6] = [7] = 07 [8] = Gt [9] [+] = [ten] = [one] = [all] = [+] = [+] = [+] = [] [[]] T [+] [+] = [+

There are three standard input and output in Linux, namely Stdin,stdout,stderr, the corresponding number is 0,1,2.STDIN is the standard input, read the information by default from the keyboard, stdout is the standard output, by default output output to the terminal, that is, the display and so on, stderr is a standard error message, the default will be displayed on the terminal. Since stdout and stderr are displayed by default on the terminal, in order to distinguish between the information, the