read -p "Enter the number: " num if [ $num -lt 0 ]; then echo "Number $num is negative" elif [ $num -gt 0 ]; then echo "Number $num is positive" else echo "Number $num is zero" fi 让我运行它来涵盖这里的所有三种情况: Running a script with bash elif statement 用逻辑运算符...
echo "All the command-line parameters are: "$*"" if [ $# -lt "$MINPARAMS" ] then echo echo "This script needs at least $MINPARAMS command-line arguments!" fi echo exit 0 运行代码: bash test30.sh 1 2 10 The name of this script is "test.sh". The name of this script is "t...
if [ condition ]; then # Code to be executed if the condition is true else # Code to be executed if the condition is false fi Q. How do I use the if-elif-else statement in a bash script to handle multiple conditions? Theif-elif-elsestatement in Bash allows you to handle multiple ...
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...
In this example, the script first checks if ‘a’ is greater than ‘b’. If it’s not, it moves on to the ‘elif’ statement to check if ‘a’ is greater than ‘c’. If neither condition is met, it executes the ‘else’ statement, which in this case, prints ‘a is not greate...
if 语句是 Bash 脚本中用于进行条件判断的控制结构。它允许脚本根据不同的条件执行不同的命令或代码块。下面是 if 语句的基础概念、优势、类型、应用场景以及常见问题的解答。 基础概念 if 语句的基本语法如下: 代码语言:txt 复制 if condition then # 执行的命令或代码块 elif another_condition then # 另一条件...
除了"if,else" 形式之外,还有其它形式的 "if" 语句: 代码如下: if [ condition ] then action fi 只有当 condition 为真时,该语句才执行操作,否则不执行操作,并继续执行 "fi" 之后的任何行。 代码如下: if [ condition ] then action elif [ condition2 ] ...
elif [ $numberTwelve -gt 12 ] then echo "numberTwelve variable is greater than 12" else echo "neither of the statemens matched" fi 输出如下: [zexcon@fedora ~]$ ./learnToScript.sh numberTwelve variable is equal to 12 你所看到的是if语句的第一行,它在检查变量的值是否真的等于12。如果是...
if可以嵌套: if CONDITION; then if CONDITION2; then CMD fi fi 条件取反: ! COMMAND 双分支: if CONDITION; then 分支1 else 分支2 fi 练习2: 传递两个整数给脚本,返回其较大者 test.sh #!/bin/bash if $1 -gt $2;then echo $1 else ...
if [ $(id -u $1) -eq 0 ]; then echo"Admin" elif [ $(id -u $1) -ge 500 ]; then echo "Common user." else echo"System user." fi #多分支 #脚本真正判断用户id 扩展:嵌套的if语句 嵌套的if语句相对复杂一点,当条件1满足时,就运行第一个then后面的语句,在条件1满足后,在判断条件2,当...