Running a script with if statement example in bash 你是否注意到,当数字为偶数时,脚本会告诉你,但当数字为奇数时,脚本不会显示任何内容? 让我们使用 else 来改进这个脚本。 使用if else 语句 现在我在前面的脚本中添加了一条else语句。这样,当你得到一个非零模数(因为奇数不能除以 2)时,它将进入else块。
bash shell if-statement while-loop m3u 我正在编写一个脚本来解析m3u文件。目标是检索变量标记和url。我用这个文件做了测试。 #!/bin/bash echo "name,tvg-id,tvg-name,tvg-country,group-title,languages,url" while IFS= read -r line; do tags_detect="$(echo "$line" | grep -Eo '^#EXTINF:')...
I made a script to check tnsping but the if statement does not working properly. The following is the script: ping=$(tnsping oracle1 |grep OK| awk -F" " '{print $1 }') if [ -n $ping ] then echo "OK" else echo "NOT OK" fi If a execute change oracle for a non-existing...
A Shell script usually needs to test if a command succeeds or a condition is met. In Bash, this test can be done with a Bash if statement. As with any other programming language, Bash comes with conditional expressions that allow you to test for conditions and alter the control flow if ...
If statement inside command line Ask Question Asked 11 years, 8 months ago Modified 11 years, 8 months ago Viewed 111 times 0 I'm trying to create a shell script and the fact is, I want to change the output if the variable $output is filled. I was thinking about checking the variable...
Bash, short for "Bourne Again SHell," is a powerful scripting language used in Unix-based operating systems. One of the fundamental constructs in Bash programming is the if statement. The if statement allows you to control the flow of your script based on specific conditions. In this article...
Example of running bash script with logical operators in if statement 🏋️ 练习时间 让我们做一些练习吧 😃 练习1:编写一个 Bash Shell 脚本,检查作为参数提供给它的字符串的长度。如果未提供参数,它将打印 “empty string”。 练习2:编写一个 Shell 脚本来检查给定文件是否存在。你可以提供完整的文件路...
#A function to return an echo statement. helloFunc() { echo "Hello from a function." } #invoke the first function helloFunc() helloFunc 你会看到如下输出结果: [zexcon@fedora ~]$ ./learnToScript.sh Hello from a function. [zexcon@fedora ~]$ ...
An if statement checks if the age is greater than or equal to 18. The condition [ "$age" -ge 18 ] checks if the value of '$age' is greater than or equal to 18. If the condition evaluates to true, the script prints "You are an adult" using "echo". ...
Usually, Syntax Errors are the easiest errors to solve in a Bash script. They can often be found without executing the shell script. The most common syntax errors include: Improper use of square brackets or parentheses in a Bash If Statement Incorrect syntax when using a Bash Loop or a ...