Statement(s) to be executed until command is true done command 一般为条件表达式,如果返回值为 false,则继续执行循环体内的语句,否则跳出循环。 类似地, 在循环中使用 break 与continue 跳出循环。 另外,break 命令后面还可以跟一个整数,表示跳出第几层循环。 Shell函数 Shell函数
5 - case语句 case语句为多选择语句。可以用case语句匹配一个值与一个模式,如果匹配成功,执行相匹配的命令 基础语法格式: case 值 in 模式1) Statement1 ;; 模式2) Statement2 ... ;; esac 基础语法说明: 模式部分可以为元字符,例如: * 任意字符 ? 任意单字符 [...] 范围中任意字符 使用示例: #! /...
case word in [ [(] pattern [ | pattern ] ... ) list ;; ] ... esac A case command first expands word, and tries to match it against each pattern in turn The word is expanded using tilde expansion, parameter and variable expansion, arithmetic substitution, command substitution, process ...
6.选择结构case语句 case SWITCH in value1) statement ... ;; //以双分号结尾 value2) statement ... ;; *) statement ... ;; esac 练习:写一个脚本 传递一个参数,判断这个参数是数字还是字母还是特殊字符 #!/bin/bash case $1 in [ 0-9 ]) echo "Adigit";; [ a-z ]) echo "Lower";; ...
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 condition, and controls the flow of...
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Bash break Statement Thebreakstatement ends the current loop iteration and exits from the loop. When combined with a condition,breakhelps provide a method to exit the loop before the end case happens. The Bashbreakstatements always apply to loops. ...
We can also write that script using the case statement. In the case statements, ;; represents a case break, so if the variable value meets any of the conditions, it jumps to the end of the script:#!/bin/bashecho "Enter a valid number"read ncase $n in101)echo "This is the first...
1.Vim的使用 一般指令模式:vim进去模式的模式 编辑模式:在一般模式下按 “i, I, o, O, a, A, r, R” 可以进入编辑模式 命令行命令模式:在一般模式下输入 “: / ?” 任意一个,可以将光标移动到最下面那一列 vim fileName可以新建一个文件,编辑完后按ESC输入:wq即可完成编辑且退出,若文件权限不对无法...
Additionally, the ti=$(($ti + 0)) statement is used for converting the value of ti from string to integer. Last, before exiting, combine.sh prints the total number of times the while word was found in all processed files. ./combine.sh Total: 2 The Case Statement The bash scripting...