0 - This is a modal window. No compatible source was found for this media. ageage}elseif(age<21){printf("You need to be over 21\n");}else{printf("You are over 18 and older than 21 so you can continue \n");}} Output
Commands (including the scripts and shell functions we write) issue a value to the systemwhen they terminate, called an exit status. This value, which is an integer in the range of0 to 255, indicates the success or failure of the command’s execution. By convention, avalue of zero indica...
Bourne Shell (sh),是 Unix 系统的默认 Shell,简单轻便,脚本编程功能强,但交互性差。 Bourne Again Shell,即 Bash,是 GNU 开发的一个 Shell,也是大部分 Linux 系统的默认 Shell,是 Bourne Shell 的扩展。 Bash 允许用户定制环境以满足自己需要。通过修改环境文件.bash_profile、.bashrc、.bash_logout,配置合适...
Table of conditions The following table list the condition possibilities for both the single- and the double-bracket syntax. Save a single exception, the examples are given in single-bracket syntax, but are always compatible with double brackets. 1. File-based conditions: With the double-parenthes...
Just like any other programming language, you can use the elseif command in expect as shown below. if { $count < 0} { puts "Success Condition1 : $count\n"; } elseif { $count == 0 } { puts "Success Condition2 : $count\n"; ...
Conditional Statements: IF-FI Statement: Syntax if [ condition ] then Statement(s) ###executed if condition is true ### else &nbs...Become a member and unlock all Study Answers Start today. Try it now Create an account Ask a question Our experts can answer your t...
格式: case $变量名 in "值1") 如果变量的值等于值1,则执行程序1 ;; "值2") 如果变量的值等于值2,则执行程序2 ;; ...省略其他分支... *) 如果变量的值都不是以上的值,则执行此程序 ;; esac 例1.判断用户输入 代码语言:javascript 代码运行次数:0 运行 AI代码解释 #!/bin/bash #Author: yu...
--[ local variable definition --] a = 10; --[ check the boolean condition using if statement --] if( a < 20 ) then --[ if condition is true then print the following --] print("a is less than 20" ); end print("value of a is :", a); Output...
est command or [ expr ] is used to see if an expression is true, and if it is true it return zero(0), otherwise returns nonzero for false. Syntax: test expression OR [ expression ] Example: Following ...
Syntax: if (conditional-expression) { action1; action2; } If the condition is true, all the actions enclosed in braces will be performed in the given order. After all the actions are performed it continues to execute the next statements. ...