如果 condition1 成立，那么就执行 if 后边的 statement1；如果 condition1 不成立，那么继续执行 elif，判断 condition2。如果 condition2 成立，那么就执行 statement2；如果 condition2 不成立，那么继续执行后边的 elif，判断 condition3。如果 condition3 成
'Else if'in bash scripting, often written as'elif', is used to check multiple conditions in your code. It is used with the syntax,if [firstStatement]; then... elif [secondCondition]; then... else. It’s a powerful tool that allows your scripts to make decisions based on various scen...
1.1 if格式 if condition; then commands; fi 1.2 else if 和 else if condition; then...
User input validation is crucial in shell scripting to ensure that the input provided by the user is valid and can be processed correctly. If-else statements can be used to validate user input and prompt the user to enter valid input if necessary. Here’s an example of a script that valid...
In the case of the && construct, if the first command fails, the shell uses its exit code for the if statement, but if the first command succeeds, the shell uses the exit code of the second command for the conditional. In the case of the || construct, the shell uses the exit code...
The if statement Here is a basic example of the if statement: PowerShell Copy $condition = $true if ( $condition ) { Write-Output "The condition was true" } The first thing the if statement does is evaluate the expression in parentheses. If it evaluates to $true, then it executes ...
Scripting 1. Introduction As the ubiquitous Linux shell,Bashhas its own features and scripting syntax, which upgrade those of the regularshshell. On the other hand, most shells agree on how the basicconditional expressionswork at the logical and syntactic levels. ...
Improper use of square brackets or parentheses in a Bash If Statement Incorrect syntax when using a Bash Loop or a Bash Array Incorrect use of a compound command when defining a Bash Function Runtime ErrorA Runtime Error will be the next level of errors. The shell script runs with no synt...
If File exists then copy it script powershell If is not recognized as the name of a cmdlet? if not contains If statement based on day of the week evaluating despite being false If Test-Connection do these action else exit. If variable is null or empty skip in script If with multiple c...
This chapter describes the extensions of the Nashorn engine that enable you to use UNIX shell scripting features for JavaScript scripts.