shell theorem definition

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 ()

]} 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

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

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

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 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

] ~]# 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 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

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

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 ()

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