Create a Bash file with the following script that prints any of the three messages based on the “if” condition. The first “if” condition checks whether the number of arguments is 2 or not. The second “if” condition checks whether the length of the argument value is less than 5 or...
And for that purpose, thebash has a special variable($#) which prints the count of the total number of arguments passes to the shell script appended while execution. So in this guide, I will walk you through various examples of how you can use the$#variable to get the total number of ...
abhishek@itsfoss:~/bash_scripts$ ./reverse.sh ubuntu fedora arch Arguments in reverse order: arch fedora ubuntu 练习2:编写一个脚本,显示传递给它的参数数量。 提示:使用特殊变量 $#。 预期输出: abhishek@itsfoss:~/bash_scripts$ ./arguments.sh one and two and three Total number of arguments: 5...
如果需要逐个处理参数,可以使用$1、$2等变量来获取第一个、第二个参数等。 以下是一个简单的Bash脚本示例,用于接收和重新引用参数: 代码语言:bash 复制 #!/bin/bash # 获取参数个数 num_args=$# # 输出参数个数 echo "Number of arguments: $num_args" # 逐个处理参数 for arg in "$@" do echo "A...
In Bash scripting, it's often necessary to verify the number of arguments passed to a script to ensure correct script execution. This is crucial in scenarios
bash 中有很多内置的特殊变量,使用非常方便。如下是最常见的: 大家可以实际查看一下这些特殊变量,参考如下 variables.sh 脚本: 复制 #!/bin/bashecho"Name of the script:$0"echo"Total number of arguments:$#"echo"Values of all the arguments:$@" 1. 2. 然后提供几个参数运行脚本:...
based on the number of arguments. 0 arguments The expression is false. 1 argument The expression is true if and only if the argument is not null. 2 arguments If the first argument is !, the expression is true if and only if the second argument is null. If the first argument is one ...
[ -f"$filename"]thenif[ $verbose -gt0]thenprintf"Filename %s found\n""$filename"fielseif[ $verbose -gt0]thenprintf"File, %s, does not exist\n""$filename">&2fiexit2fi# 如果选择了verbose选项,打印保留在命令中的数值参数if[ $verbose -gt0]thenprintf"Number of arguments is %d\n""...
The behavior of test depends on the number of arguments. Read the bash manual page for the complete specification. String operators: -z STRING True if string is empty. -n STRING STRING True if string is not empty. 即,test命令使用-z STRING操作符来判断STRING字符串的长度是否为 0。
$@: Get the list of passed arguments to the bash script Think of this as an advanced form of the above example where you also get the name of the passed arguments in a column. Here, I created a simple script that will give you the total number of arguments and the list of passed ...