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...
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 ...
Learn how to use the case esac statement in Unix for effective conditional processing. Explore syntax and examples to enhance your scripting skills.
The following article describes the basic syntax and includes a simple example of the BASHCASEstatement usage. TheCASEstatement is the simplest form of theIF-THEN-ELSEstatement in BASH. You may use theCASEstatement if you need theIF-THEN-ELSEstatement with manyELIFelements. With the BASHCASEstat...
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:...
*) echo -e "[ERROR] = Wrong Input, Exiting the script.." esac User confirmation using case statement Example 5 - Case statement with return codes You can write logic to capture the return code of the previously run command and take some actions using case statements. I am creating a GUI...
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....
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 $1 in 4 [0-9]) 5 echo “A Digit.” ;; 6 [a-z]) 7 echo “Lower.” ;; 8 [A-Z]) 9 echo “Upper.” ;; ...
Bash shell case statement is similar to switch statement in C. It can be used to test simple values like integers and characters. Case statement is not a loop, it doesn’t execute a block of code for n number of times. Instead, bash shell checks the cond
In this section, we'll see couple of examples of the 'if/elif/else' statement.Exampe #1:#!/bin/bash # b.sh if [ "$#" -gt 0 ] then echo "There are $# args!" fi if [ "$1" = "arg1" ] then echo "argument 1 is $1" fi Output:...