If-statement-Bash-Script-Example if-else Statement 除了普通的 if 语句之外,我们还可以用 else 块扩展 if 语句。基本思想是,如果语句为真,则执行 if 块。如果语句为假,则执行 else 块。 Syntax : if [ condition_command ] then command1 command2 …….. last_command else command1 command2 …….. ...
1.1 if格式 if condition; then commands; fi 1.2 else if 和 else if condition; then...
if[command];thenelsefi 1.3 if语法格式 代码语言:shell AI代码解释 if[command];thenfi 2. 字符串运算符 代码语言:text AI代码解释 = 检测两个字符串是否相等,相等返回 true。 [ $a = $b ] 返回 false。 != 检测两个字符串是否不相等,不相等返回 true。 [ $a != $b ] 返回 true。 -z 检测字符...
Here are some useful examples of if-else in shell scripts to give you a better idea of how to use this tool. Command Description && Logical AND $0 Argument 0 i.e. the command that’s used to run the script $1 First argument (change number to access further arguments) -eq Equality ch...
一、if 语句 if 语句通过关系运算符判断表达式的真假来决定执行哪个分支。 Shell 有三种 if ... else 语句: if ... fi 语句; if ... else ... fi 语句; if ... elif ... else ... fi 语句。 语法格式: if [ expre
在大多数情况下,我已经能够得到它的大部分工作,除了当涉及到数字检查部分。我不完全确定是否正确地执行了嵌套的if语句,因为它同时显示了“if”和“else”回音。 我目前的剧本: q=y # Begins loop until [[ $q == n ]];do # Checks command line arguments ...
[ TEST_COMMAND ] && ( THEN_EXPRESSIONS ) || ( ELSE_EXPRESSIONS ) Here, based on the result ofTEST_COMMAND, the script either executes theTHEN_EXPRESSIONSorELSE_EXPRESSIONS. Obviously, there’s a lot of spacing in the above scripts, much of which may not be needed. Let’s see how we...
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...
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 conditions sequentially, as in the example below. ...
四、if…elif…else 适用范围:多于两个以上的判断结果,也就是多于一个以上的判断条件。 代码语言:javascript 代码运行次数:0 运行 AI代码解释 if [ condition 1] 满足第一个条件 then 真 command1 执行command1代码块 elif [ condition 2] 满足第二个条件 then 真 commands2 执行command2代码块 ... else 如...