If the conditional expression is true, it executes the statement1 and 2. If the conditional expression returns zero, it jumps to else part, and executes the statement3 and 4. After the execution of if/else part, execution resume with the consequent statements. if then else fi example: #!/...
OK, it works, but it's not very functional. Before we make it more useful, let's take a look at the "if" statement used above. In it, we have a boolean expression. In bash, the "=" comparison operator checks for string equality. In bash, all boolean expressions are enclosed in s...
if[<some test>]then<commands>else<other commands>fi if elif else if[<some test>]then<commands>elif[<some test>]then<different commands>else<other commands>fi boolean运算 && || #!/bin/bashif[ -r $1] && [ -s $1]thenechoThisfileis useful.fi case 语句 case<variable>in<pattern1>)<...
这是我建议你检查你的方式"booleans"。他们的工作是可能的。 123456789101112 bool=true if ["$bool" = true ]; then if ["$bool" ="true" ]; then if [["$bool" = true ]]; then if [["$bool" ="true" ]]; then if [["$bool" == true ]]; then if [["$bool" =="true" ]]; ...
An if statement will execute a portion of code if a given condition is met. It is often referenced as an If-Then, If-Else, or If-Then-Else statement. An if statement always tests for a boolean condition to evaluate to true or false. The then, else if (elif), and else are clause...
# debug_demo.sh:an exampleofa debug trap trap ‘:CNTis now $CNT’DEBUGdeclare-iCNT=0while[$CNT-lt3];doCNT=CNT+1done 当进行跟踪时, CNT 的值在每一行后面显示: 代码语言:js AI代码解释 $ bash-x debug_demo.sh+trap ‘:CNTis now $CNT’DEBUG+declare-iCNT=0++:CNTis now0+‘[‘0-lt...
我有一个函数,它循环遍历我的Outlook收件箱,如果有一封符合我设定条件的电子邮件,返回Boolean作为最终结果。即使条件错误,函数也总是返回true。我将.Sender替换为xxxxxxx,它还返回True。Sender.GetExchangeUser.PrimarySmtpAddress = "xxxxxxx" And _ GetSMTPAddressForRecipients(.To) = fpemail T 浏览2提问于2018-...
if [ $((num % 2)) == 0 ] || [ $((num % 5)) == 0 ]; then echo "$num is even or divisible by 5." fi Output 50 is even or divisible by 5. Bash OR Operator in While Loop Expression In this example, we shall use Bash OR boolean logical operator inwhileexpression. ...
boolean. Default value:false. If this is true, this task will fail if any errors are written to theStandardErrorstream. bashEnvValue-Set value for BASH_ENV environment variable string. If the input is specified, its value is expanded and used as the path of a startup file to execute bef...
Here, the if statement will check whether the condition is true or false. Using the test command, we can easily get the Boolean value. Run the script with and without root privilege. $ ./dummy.sh $ sudo ./dummy.sh It’s a simple if-else statement demonstration. Feel free to check ou...