If statement and else statement could be nested in bash. The keyword “fi” indicates the end of the inner if statement and all if statement should end with the keyword “fi”. The “if then elif then else fi” example mentioned in above can be converted to the nested if as shown belo...
bash之流程控制if/else(条件判断)、case语句 格式:单分支、双分支、多分支 if [ 条件判断式 ]; then 语句块 //当条件判断式为真时,执行该语句块 fi if [ 条件判断式 ]; then 语句块 //当条件判断式为真时,执行该语句块 else 语句块 //当条件判断式为假时,执行该语句块 fi case语句:重分支的应用场...
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 go to next elif [ expression ]; then ## execute this block if condition is ...
'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...
重要地记住 then 和 fi 在shell里面被认为是分开的语句。因此,在命令行上使用的时候,他们用分号隔开。 在脚本中,if语句的不同部分通常是良好分隔的。以下是一些简单的例子: 7.1.1.3. 检查文件 第一个例子检查一个文件是否存在: anny ~> cat msgcheck.sh #!/bin/bash echo "This scripts checks the ...
if 判断条件1; then statement1 ... elif 判断条件2; then statement2 ... elif 判断条件3; then statement3 ... else statement4 ... fi 练习:写一个脚本 判断当前系统上是否有用户的默认shell为bash; 如果有,就显示有多少个这类用户;否则,就显示没有这类用户 ...
This Linux if command tutorial shows you how to build if then else elif fi conditional logic in bash shell scripts with examples and if statement syntax. A quick summary of Linux if keyword with examples and video tutorial.
LogicalORin bash scripts is written with double vertical bars||. Let’s try the previous example again with a slight variation to test out an example of the logical OR operator: #!/bin/bash read-p"Enter a number: "USER_INPUT if[[$USER_INPUT-lt10||$USER_INPUT-ge100]];then ...
(2)双分支if语句: if 条件; then 语句1 语句2 ··· else 语句3 语句4 ··· fi #意为如果条件满足就执行语句1,2,···,否则执行语句3,4,··· (3)多分支if语句: if 条件1; then 语句1 语句2 ··· elif 条件2; then 语句3 语句4 ·...
These conditional statements will allow you to make decisions based on a specific condition. We have conditional blocks that are commonly used in bash scripts. If statement First, the condition will be evaluated, if the condition is true then the command will run. If the specified condition is...