Statement(s) to be executed if expression 1 is true elif [ expression 2 ] then Statement(s) to be executed if expression 2 is true elif [ expression 3 ] then Statement(s) to be executed if expression 3 is true else Statement(s) to be executed if no expression is true fi 二、if语...
We have discussed already what a switch case, its syntax is. Now, we will see in detail how it will work in shell scripting. Initially, we initialize a variable with an expression or value and conditional statement checks whether it satisfies any condition, if yes then it will execute the ...
Shell case esac 语句case ... esac 与其他语言中的 switch ... case 语句类似,是一种多分枝选择结构。case 语句匹配一个值或一个模式,如果匹配成功,执行相匹配的命令。case 语句格式如下:case 值in 模式1) command1 command2 command3 ;; 模式2) command1 command2 command3 ;; *) command1 command2 ...
Unix Case Esac Statement - Learn how to use the case esac statement in Unix for effective conditional processing. Explore syntax and examples to enhance your scripting skills.
Conditional statements help in deciding the proper execution path for operations. Unix/Linux Shell supports two conditional statements: The if...else statement The case...esac statement Control statements are used to indicate how the control is transferred during the program execution....
Example of a BASH Script with the CASE Statement #!/bin/bash printf 'Which Linux distribution do you know? ' read DISTR case $DISTR in ubuntu) echo "I know it! It is an operating system based on Debian." ;; centos|rhel) echo "Hey! It is my favorite Server OS!" ...
statement ;; esac 编写脚本,判断用户输入的字符串 #!/bin/bash # read -p "Enter string: " str case $str in linux|Linux) echo "windows." ;; windows|Windows) echo "linux." ;; *) echo "other." ;; esac 特殊变量: 位置变量 $1, $2 ,$3 ,$4 ... $9, ${10}, $1:...
statement … ;; *) statement … ;; esac 例:输入随便输入一个字符判断字符类型。 1 #!/bin/bash 2 # 3 case $1 in 4 [0-9]) 5 echo “A Digit.” ;; 6 [a-z]) 7 echo “Lower.” ;; 8 [A-Z]) 9 echo “Upper.” ;; ...
Bash shell case statement is similar to switch statement in C. It can be used to test simple values like integers and characters. Case statement is not a loop, it doesn’t execute a block of code for n number of times. Instead, bash shell checks the cond
TheLinux shellenables dynamic matching, so the Bash case patterns can be flexible. The following example shows how to use thecasestatement to check which character type the user has entered. Follow the steps below: 1. Create the script: ...