1、不能使用程序中的保留字:例如if、for; 2、只能使用数字、字母及下划线,且不能以数字开头;bash的配置文件: 按生效范围划分,存在两类: 全局配置: /etc/profile /etc/profile.d/*.sh /etc/bashrc 个人配置: ~/.bash_profile ~/.bashrc 按功能划分,存在两类: profile类:为交互式登录的shell提供配置 bashrc...
可以看到执行的过程 -n：不执行脚本，检查脚本语法是否有问题，给出错误的提示 -v：执行脚本时，先将...
ifCONDITION-TO-TEST;then CODE-TO-EXECUTE-1 elifNEXT-CONDITION-TO-TEST;then CODE-TO-EXECUTE-2 elifNEXT-CONDITION-TO-TEST;then CODE-TO-EXECUTE-2 else CODE-TO-EXECUTE-2 fi Note: In the above general syntax that you can include zero, one or multipleELIFconditions in the code block and the...
If statement and else statement could be nested in bash. The keyword “fi” indicates the end of the inner if statement and all if statement should end with the keyword “fi”. The “if then elif then else fi” example mentioned in above can be converted to the nested if as shown belo...
The generic if-else syntax is like this: if [ expression ]; then ## execute this block if condition is true else go to next elif [ expression ]; then ## execute this block if condition is true else go to next else ## if none of the above conditions are true, execute this block ...
This shows a description of the command's syntax and options. To demonstrate, enter mkdir --help. The output looks something like this:Output Copy Usage: mkdir [OPTION]... DIRECTORY... Create the DIRECTORY(ies), if they do not already exist. Mandatory arguments to long options are ...
bash: syntax error near unexpected token Error Now let us switch gears and check out ways in which you can resolve the above error. Fix 1: Use a Backslash to Escape Parenthesis If you insist on having a file name with parenthesis, the solution is to prefix each of the parentheses brackets...
A basic if statement commands that if a particular condition is true, then only execute a given set of actions. If it is not true, then do not execute those actions. If statement is based on the following format: Syntax of If statement ...
在Bash中使用heredoc文档后的控制运算符可以通过以下步骤实现: 1. 创建一个包含控制运算符的heredoc文档。Heredoc是一种在脚本中定义多行字符串的方法,它以特定的标识符开始和结束...
TL;DR: How Do I Use ‘Else If’ in Bash Scripting? '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 ...