# shell theorem definition

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### [Few notes] clear definition of Dedekind cutting theorem

1 , theorem contentDedekind cutting theorem: Set is a cut of the real number set, or there is a maximum number, or there is a minimum number.Definite definition: The number set of the upper bound must have an upper bound, and the number set of the lower bound must have a definite boundary.2. Certification processSet of non-null sets has upper boundRemember, that

### Shell Script Learning 13 Shell array: definition of shell array, array length

The shell is much more programmatic in terms of programming than Windows batch processing, both in loops and operations.Bash supports one-dimensional arrays (which do not support multidimensional arrays) and does not limit the size of arrays. Similar to the C language, the subscript of an array element is numbered starting with 0. Gets the elements in the array to take advantage of subscript, the subscript can be an integer or an arithmetic expression

### Linux Shell Custom Function method (definition, return value, variable scope) _linux shell

as defining a new command, which is a command, so that each input parameter is separated directly by a space. Once, the command to get the parameters of the method can be passed: \$ ... \$n get. The \$ \$ represents the function itself. 3, function return value, only through \$? The system variable is obtained, the direct pass =, the obtained is the null value. In fact, we follow the above understanding, know that the function is a command, in the shell

### "Go" shell tutorial--06 Shell variable: Shell variable definition, delete variable, read-only variable, variable type

Myurl="http://see.xidian.edu.cn/cpp/shell/" ReadOnly Myurl Myurl="http://see.xidian.edu.cn/cpp/danpianji/" Run the script with the following results:/bin/sh:name:this variable is read only.Delete a variableUse the unset command to delete a variable . Grammar: Unset variable_name The variable cannot be used again after it has been deleted; The unset command cannot delete a read-only variable.As an example:

### Shell array: Definition of shell array, array length

The shell is much more programmatic in terms of programming than Windows batch processing, both in loops and operations.Bash supports one-dimensional arrays (which do not support multidimensional arrays) and does not limit the size of arrays. Similar to the C language, the subscript of an array element is numbered starting with 0. Gets the elements in the array to take advantage of subscript, the subscript can be an integer or an arithmetic expression

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### Shell array: Definition of shell array, array length

The shell is much more programmatic in terms of programming than Windows batch processing, both in loops and operations.Bash supports one-dimensional arrays (which do not support multidimensional arrays) and does not limit the size of arrays. Similar to the C language, the subscript of an array element is numbered starting with 0. Gets the elements in the array to take advantage of subscript, the subscript can be an integer or an arithmetic expression

### Linux Shell Custom Function (definition, return value, variable scope) Introduction _linux shell

: 1, the definition function can be the same as the system command, the Shell Search command, first of all in the current shell file defined in place to find, find direct execution. 2, need to obtain function value: through \$? 3. If you need to spread other types of function values, you can define the variable (this is the global variable) before the

### Shell function definition and application

valuereturn 0 returns without error.Return 1-255 has error returned3. Define and use functions in scriptsfunction definition:Functions must be defined before they are used, so the function definition should be placed in the beginning of the script,Until the shell finds it for the first time before it can be usedThe calling function uses only its name of functions.Example:\$cat func1#!/bin/bash# func1Hello (

### Linux shell custom functions (definition, return value, variable scope) Introduction

http://www.jb51.net/article/33899.htmLinux shell custom functions (definition, return value, variable scope) IntroductionThe Linux shell can be user-defined functions and can be called casually in shell scripts. Here's how to define it, and what to call attention to.I. Defining she

### Introduction to Linux shell custom functions (definition, return value, variable scope)

The Linux shell can be user-defined functions and can be called casually in shell scripts. Here's how to define it, and what to call attention to.I. Defining shell functions (define function)Grammar: [Function] funname [()] { Action [Return int;] } Description 1, can be with function fun ()

### Shell environment variables + special variables (definition of arrays and additions and deletions)

]} 5[[emailprotected] ~]# set -- "I am" shuyun yunwei.[[emailprotected] ~]# for i in "\$*";do echo \$i;doneI am shuyun yunwei.[[emailprotected] ~]# for i in "\$#";do echo \$i;done 3[[emailprotected] ~]# for i in "[emailprotected]";do echo \$i;done I amshuyunyunwei.* * Print individual parameter information * * * * * * *[[emailprotected] ~]# for i in "\$1";do echo \$i;doneI am[[emailprotected] ~]# for i in "\$2";do echo \$i;done shuyun[[emailprotected] ~]# for i in "\$3";do echo \$i;done yunwei.* * * withou

### Shell function definition and invocation

I. Function definition Grammar: [function] functionname[()]{action; [return int;]} Description 1, can be with function fun () definition, you can also directly fun () definition, without any parameters. 2, the parameter returns, can display add: return returns, if not added, will run the result as the last command, as the return value. Return followed by a value

### Function Definition and control statements in shell

1. The Function Definition Format in shell is: Function name (){ # Function body } The function definition must follow the principle first defined in use, such as defining the function print #!/bin/shfunction print(){if [ \$# -lt 1 ]then print “no parameter”;return 1;else ehco “\$1,\$2”;return 0;fi}ehco “print function is being invoked”print The return statement

### Fifth. Definition, execution, parameters and recursive functions of shell functions

Tags: Shell function definition, execution, parameter shell recursive function shellforkxxxFifth. Definition, execution, parameters and recursive functions of shell functionsBash (Bourne Again Shell) also supports functions, when

### Description of function definition formats, function parameters, and Shell functions

Description of function definition formats, function parameters, and Shell functions You can use shell to define a function, and then use it in a shell script. The Function Definition Format in shell is as follows: [ function ] fu

### The definition and use of shell script function

] ~]# CD nginx-1.11.4/[Email protected] nginx-1.11.4]#/configure--prefix=/usr/local/nginx[[email protected] nginx-1.11.4]# make make installThe script is as follows:#!/bin/bash#Nginx_cmd=/usr/local/nginx/sbin/nginxNginx_conf=/usr/local/nginx/conf/nginx.confNginx_pid_file=/usr/local/nginx/logs/nginx.pidStart () {\$nginx _cmdIf [\$?-eq 0]; Thenecho "Service Nginx start ... [OK] "Fi}Stop () {\$nginx _cmd-s Stop}Reload () {If \$nginx _cmd-t >/dev/null; Then\$nginx _cmd-s ReloadElse\$nginx _cmd-tFi}Status

### Shell script Variable definition

shell supports custom variables.Defining variablesWhen defining a variable, the variable name does not have a dollar sign (\$), such as:The code is as follows: Variablename= "value"Note that there can be no spaces between the variable name and the equals sign, which may be different from any programming language you are familiar with. At the same time, the name of the variable names must follow the following rules:• The first character must be a lette

### shell--function definition

function definition Format:[function][()]{ action; [returnint;] }Cases:#!/bin/bash Funwithreturn () { Span class= "PLN" > echo echo "Enter first number : " read anum echo " Enter a second number: " read anothernum echo " two numbers are \$aNum and \$anotherNum, respectively! " return \$ (( \$aNum + \$anotherNum } funwithreturnecho The sum of the two numbers entered is \$?! " Output: This function adds two numbers to the input

### Linux Shell Learning Note two---Custom functions (definition, return value, variable scope) Introduction

The Linux shell can be user-defined functions and can be called casually in shell scripts. Here's how to define it, and what to call attention to. I. Defining shell functions (define function)Grammar: [Function] funname [()] { Action [Return int;] } Description 1, can be with function fun ()

### Linux Shell Custom functions (definition, return value, variable scope) Introduction

obtained through the system variable, directly through =, get is a null value. In fact, we follow the above understanding that the function is a command, in the shell to obtain the command return value, all need to get through the \$? function scope, variable action rangeExample (test_fun2.sh): #!/bin/shecho \$(uname);declare num=1000;uname(){ echo "test!"; ((num++)); return 100;}testvar(){ local num=10; ((num++)); echo \$num;}un

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