本编程教程将讨论 bash 中的条件结构,尤其是具有单个和多个条件的 if 条件。 Bash 编程简介 Bash 是 UNIX 和 Linux 操作系统中的一个简单的命令行解释器。这个解释器允许我们使用命令行运行一些命令,这些命令可以通过在一个称为脚本的文件中键入它们来共同运行。 shell 脚本只不过是 bash 命令的集合,可以在 bash ...
bash 中的条件语句，基础就是 Test 。 if 先来个实例： x=5; if [ $x = 5 ]; then e...
ifCONDITION-TO-TEST;then CODE-TO-EXECUTE-1 elifNEXT-CONDITION-TO-TEST;then CODE-TO-EXECUTE-2 elifNEXT-CONDITION-TO-TEST;then CODE-TO-EXECUTE-2 else CODE-TO-EXECUTE-2 fi Note: In the above general syntax that you can include zero, one or multipleELIFconditions in the code block and the...
但它返回了：1. if 在shell中语法格式1.1 if-elif-else语法格式if [ command ];thenelif [ comman...
Using a Bash If Statement with multiple conditions Using Nested If Statements Common Pitfalls and Errors Incorrect usage of the single bracket command [ How to solve the Binary Operator Expected Error? Why you should not use the || and && operators instead of a Bash If Statement? Detailed Exam...
Multiple Conditions Test Operators Conclusion Share: This article will walk you through the basics of the bash if...else statement and explain you how to use it in your shell scripts. Decision-making is one of the most fundamental concepts of computer programming. Like in any other programming...
Q1. Can I have multiple conditions in a single if statement? A1. Yes, you can combine multiple conditions using logical operators such as && (AND) and || (OR) to create compound conditions within a single if statement. Q2. Can I use the if statement to check the existence of a file...
'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 [ $num -lt 0 ]; then echo "Number $num is negative" elif [ $num -gt 0 ]; then echo "Number $num is positive" else echo "Number $num is zero" fi Let me run it to cover all three cases here: Combine multiple conditions with logical operators ...
Either[[ ]]or[ ]should be used to evaluate the condition. If the condition is evaluated to"True", then a block of code will be executed. A conditional statement can have one if condition and multipleelifconditions. If a condition is evaluated to be true all subsequent conditional statements...