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,...
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 ...
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 ...
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。
if [ $name ] echo “Hello $name” else echo “Must’ve been my imagination” fi In the terminal: ~$bash name.sh Who is there? ~$ Must’ve been my imagination How to create a backup management script in Bash Other items to consider include setting up backup management scripts. This ...
/bin/bashif[`whoami`!='root'];then echo"Executing the installer script"./home/oracle/databases/runInstaller.shelseecho"Root is not allowed to execute the installer script"fi Executing the scriptasa root user,#./preinstaller.sh Root is not allowed to execute the installer script...
statement1 else statement2 fi if 判断条件;then statement1 .. elif 判断条件2;then statement2 ... else statement3 ... fi NAME=user1 if [ id $NAME ];then echo "admin" else echo "common users" fi 1. 2. 3. 4. 5. 6. 7.
Check to see if a variable is empty or not Create a new bash file, named, and enter the script below. The script above stores the first command-line argument in a variable and then tests the argument in the next statement. This script will print the first argument because it is not em...
1、 # bash /PATH/TO/SCRIPT_FILE 2、# ./PATH/TO/SCRIPT_FILE bash命令常见选项: bash -n bashname(脚本文件名) 检查bash脚本的语法错误 bash basename(脚本文件名) 执行脚本 bash -x bashname 显示脚本执行的详细过程 练习: 1、编辑test.sh并检查语法,显示详细的执行脚本过程(需要应用各个特殊参数表达的...
问Bash脚本: While循环和if语句ENPython 编程中 while 语句用于循环执行程序，即在某条件下，循环执行某...