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 case 的...
case expression in pattern1) statements ;; pattern2) statements ...
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. The generic if-else syntax is like this: if [ expression ]; then ## execute this block if condition is true else g...
Bash Shell Conditional Statements Conditionals let us decide whether to perform an action or not, this decision is taken by evaluating an expression. The most basic form is: if [ expression ]; then statements elif [ expression ]; then statements else statements fi ...
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 shell, for the Linux operating system. ...
An alternative to if-else statements in shell scripting is the case statement. The case statement allows you to match a value against multiple patterns and execute different blocks of code based on the match. Here’s an example: case$varin1)echo"Variable is 1.";;2)echo"Variable is 2."...
Conditions in bash scripting (if statements) Shell中判断语句if中-z至-d的意思 - sunny_2015 - 博客园 https://www.cnblogs.com/coffy/p/5748292.html Conditions in bash scripting (if statements) - Linux Academy Blog https://linuxacademy.com/blog/linux/conditions-in-bash-scripting-if-statements/...
Bash conditional statements perform different computations or actions depending on whether a programmer-specified boolean condition evaluates to true or false. These statements are used to execute different parts of your shell program depending on whethe
Let’s start with two examples showing how to use PowerShellIfstatements. Example 1: Checking if a number is positive or negative In the following example, we have a variable, $number, set to 10. TheIfstatement checks whether the value of $number is greater than 0 using the -gt operator...
So far all the if else statement you saw were used in a proper bash script. That's the decent way of doing it but you are not obliged to it. When you just want to see the result in the shell itself, you may use the if else statements in a single line in bash. ...