在bash 脚本中,if 语句检查一个条件是否为真。如果是,shell 执行与 If 语句相关的代码块。如果语句不为真,则 shell 跳过 If 语句块的末尾并继续执行。 在本指南中,我们将解释如何在 bash 脚本中使用 if 语句。在 bash shell 脚本中,If 语句可以以 If、If- else、If- If- else、netsted If 和 cas
#!/bin/bashcase$1in"hello")echo"Hello, I am fine,thank you!";;"")echo"你必须要输入一个...
An important thing to keep in mind is that, like C programming, shell scripting is case sensitive. Hence, you need to be careful while using the keywords in your code. How to use if-else in shell script It is easy to see the syntax of a function and believe you know how to use it...
An important thing to keep in mind is that, like C programming, shell scripting is case sensitive. Hence, you need to be careful while using the keywords in your code. How to use if-else in shell script It is easy to see the syntax of a function and believe you know how to use it...
Scripting 1. Introduction As the ubiquitous Linux shell,Bashhas its own features and scripting syntax, which upgrade those of the regularshshell. On the other hand, most shells agree on how the basicconditional expressionswork at the logical and syntactic levels. ...
Bash Scripting and Conditional Statements To fully grasp the power of ‘else if’ in bash scripting, it’s essential to understand the fundamentals of bash scripting, conditional statements, and flow control. What is Bash Scripting? Bash (Bourne Again SHell) is a command-line interpreter, or s...
[ is a shellbuiltin$typetesttestis a shellbuiltin 又说这是叫 builtin,坑爹,不过常用命令如 cd、echo 都是这样的。 但是说双方括号是「关键词」,关键词就是 bash 自己内建的语法分析: $type[[ [[isa shell keyword 就因为这是关键词,所以被双方括号包围的代码都有另外一种意义,&&、||、>和<</CODE...
If this, then that else something else. Doesn't make sense? It will after you learn about the if-else statements in bash shell scripting. Bash supports if-else statements so that you can use logical reasoning in your shell scripts.
= - is not equal to - if [ "$a" != "$b" ] < - is less than, in ASCII alphabetical order - if [[ "$a" < "$b" ]] > - is greater than, in ASCII alphabetical order - if [[ "$a" > "$b" ]] -z - string is null, that is, has zero length...
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