bash:带if-statement的循环 在我的Bash脚本中,我在目录中的文件循环和一个简单的if-stalal来过滤特定文件。然而,它并不像我期望的行为,但我看不到为什么。 (我知道我可以过滤用于for-循环表达式的文件扩展(... in "*.txt"),但在我实际情况下,条件更复杂。) 这是我的代码: #!/bin/bash forfin"*" do ...
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...
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...
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. Bash If..then..fi statement if [ conditional expression ] then statement1 statement2 . fi This if statement is also called as simple if statement. If the given conditional expression is true, it enters and executes the statements enclosed between the keywords “then” and “fi”. If th...
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 ...
Statement(s) to be executed if command is true done 例如: COUNTER=0 while [ $COUNTER -lt 5 ] do COUNTER='expr $COUNTER+1' echo $COUNTER done until 循环 until 循环执行一系列命令直至条件为 true 时停止。until 循环与 while 循环在处理方式上刚好相反。 常用格式为: ...
if [ $mod -eq 0 ]; then echo "Number $num is even" else echo "Number $num is odd" fi Let's run it again with the same numbers: As you can see, the script is better as it also tells you if the number is odd. Use elif (else if) statement ...
双分支的if语句: if 判断条件;then statement1 statement2 ... else statement3 statement4 fi Note: if语句进行判断是否为空 [ "$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...
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/...