'Else if'in bash scripting, often written as'elif', is used to check multiple conditions in your code. It is used with the syntax,if [firstStatement]; then... elif [secondCondition]; then... else. It’s a powerful tool that allows your scripts to make decisions based on various scen...
If-elif-else Statement 在bash 脚本中,如果希望使用 if 语句应用多个条件,则使用 if elif else。在这种类型的条件语句中,如果满足第一个条件,则执行下面的代码,否则检查下一个 if 条件,如果不匹配,则执行下面的 else 语句中提到的命令。其语法和示例如下所示。 Syntax : if [ condition_command ] then comman...
Here’s the samplebash shell script: #!/bin/bash n=10 if [ $((n%2))==0 ] then echo "The number is even." else echo "The number is odd." fi The output of the above script is: The number is even You’ll notice two interesting things about the above sample script: ...
Bash, short for "Bourne Again SHell," is a powerful scripting language used in Unix-based operating systems. One of the fundamental constructs in Bash programming is the if statement. The if statement allows you to control the flow of your script based on specific conditions. In this article,...
如果statement和else语句可以嵌套在bash脚本中。__关键字'fi'显示内部if语句的结尾,所有if语句都应以关键字'fi'结尾。 __ Syntax: if [ condition_command ] then command1 command2 …….. last_command else if [ condition_command2 ] then command1 command2 …….. last_command else command1 command...
Bash脚本是一种在Linux和Unix系统中常用的脚本语言,用于自动化任务和批处理。IF语句是Bash脚本中的条件语句,用于根据条件的真假来执行不同的操作。 当Bash脚本中的IF语句不起作用时,可能有以下几个可能的原因和解决方法: 语法错误:检查IF语句的语法是否正确,包括条件表达式的书写和语句块的缩进。IF语句的基本语法是:...
如果所有的 if 和 elif 判断都不成立，就进入最后的 else，执行 statementn。#!/bin/bashreadageif(...
case "$param" in *[!\ ]*) echo "\$param contains characters other than space";; *) echo "\$param consists of spaces only";; esac The$'…'syntax, which is specific to ksh/bash/zsh, allows you to check for whitespace characters. These characters can be included in your script eithe...
syntax error near unexpected token fi 等都是这样引起的. 5 if 后面一定要跟上 then. 同理 elif 后面一定要跟上 then. 不然提示出错信息: syntax error near unexpected token else top BASH IF http://lhsblog01.blog.163.com/blog/static/10200451920081118105937818/ ...
bash的if grep语句与 bash的基础特性: bash中的变量的种类: 根据变量的生效范围等标准: 本地变量:生效范围为当前shell进程:只对当前shell进程有效,当前shell的子shell进程均无效 环境变量:生效范围为当前shell进程及其子进程,对其他shell无效(定义:declare -x) ...