case expression in pattern1) statements ;; pattern2) statements ...
if elif else Shell 支持任意数目的分支，当分支比较多时，可以使用if elif else 结构，它的格式为：i...
The function of if-else in shell script is an important asset for shell programmers. It is the best tool to use when you need to execute a set of statements based on pre-defined conditions. The if-else block is one, if not the most essential part of conditional programming. By regulatin...
Bash (Bourne Again SHell) is a command-line interpreter, or shell, for the Linux operating system. A bash script is a file containing a series of commands that the bash shell can execute. These scripts can automate tasks, perform file manipulations, and much more. Understanding Conditional St...
Interactive Usage of CSH If Statements, Csh inline if statements, Syntax of Expression in C Shell's 'if' Statement, Shell Script if Statement Contains Mistake
Shell中判断语句if中-z至-d的意思 - sunny_2015 - 博客园 https://www.cnblogs.com/coffy/p/5748292.html Conditions in bash scripting (if statements) - Linux Academy Blog https://linuxacademy.com/blog/linux/conditions-in-bash-scripting-if-statements/ ...
每一条命令;不管是内置的,shell 函数,还是外部的,当它退出时,都会返回一个小的整数值给引用它的程序,这就是大家所熟知的程序的退出状态.在 shell 下执行进程是,有很多方式可取用程序的退出状态. 以管理来说,退出状态为 0 表示”成功”,也就是,程序执行完成且为遭遇到任何问题.其他任何的退出退出状态都为失败...
Using Nested If Statements A nested if statement is an if statement inside a clause of another if statement. Nothing prevents multiple levels of if statement in a shell script and in Bash. if first-test-commands; then if second-level-test-commands; then consequent-commands; else second-level...
If we were to convert the script above to a shell function to includeit in a larger program, we could replace the exit commands with return statementsand get the desired behavior: 类似地,通过带有一个整数参数的 return 命令,shell 函数可以返回一个退出状态。如果我们打算把上面的脚本转变为一个 ...
The if and else statements take a script block, so we can place any PowerShell command inside them, including another if statement. This allows you to make use of much more complicated logic. PowerShell Copy if ( Test-Path -Path $Path -PathType Leaf ) { Move-Item -Path $Path -Desti...