Example 2: Checking the “If -N” Statement with the “Test” Command Create a Bash file with the following script where the use of the “if –n” statement with the “test” command is shown. The first input is a string and the second input is numeric. If both input values are non...
问在bash中使用内联if-statement添加命令参数ENexport export命令将会使得被 export 的变量在运行的脚...
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...
在转向if语句之前,让我们看看if语句中一些常用的条件运算符。 使用带有一个条件的if语句 语法: if[condition-statement];thenCommands..fi 让我们看一个使用if条件的示例 bash 脚本。 脚本: #!/bin/bashecho"Enter your marks out of 100: "readmarksif[$marks-gt100];thenprintf"You have entered incorrect ...
1 单分支if语句 if 判断条件; then statement1 statement2 ... fi 2 双分支的if语句: if 判断条件; then statement1 statement2 ... else statement3 statement4 ... fi 3 多分支的if语句: if 判断条件1; then statement1 ... elif 判断条件2; then ...
An exit status of zero, and only zero, is a success, i.e. a condition that is true. Any other exit status is a failure, i.e. a condition that is false. The syntax of the if statement in Bash is: if first-test-commands; then consequent-commands; [elif more-test-commands; then ...
双分支的if语句: if 判断条件;then statement1 statement2 ... else statement3 statement4 fi Note: if语句进行判断是否为空 [ "$name” = "" ] 等同于 [ ! "$name" ] [ -z "$name" ] Note: 使用if语句的时候进行判断如果是进行数值类的 ,建议使用 let(())进行判断 对于...
if [ $mod -eq 0 ]; then echo "Number $num is even" else echo "Number $num is odd" fi Let's run it again with the same numbers: As you can see, the script is better as it also tells you if the number is odd. Use elif (else if) statement ...
unix bash在if-statement中使用STDIN字符串 这是因为在linux上，/dev/fd/0（或/proc/self/fd/0或/...
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 or directory?