Hence, you need to be careful while using the keywords in your code. How to use if-else in shell script It is easy to see the syntax of a function and believe you know how to use it. But it is always a better choice to understand a function through examples because they help you ...
Naturally, this is not optimal. On top of this, involving more advanced shell features such as loops and conditions, we might end up with some complex syntax. 3. Conditional Statements As we’ve already seen, basicif–elsestatements conform to thePOSIXstandard: ...
'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...
syntax error near unexpected token `fi' 或是 then 的 shell 的 if else 用法: if ...; then ... elif ...; then ... else ... fi 当运行下面脚本时,如果 if 后的 $a 不加引号,则会报: test.sh: line 5: [: too many arguments 这个错误...
else echo "Unknown option, ignore it." rm -f $3 exit 5 fi vim + $3 if bash -n $3 &> /dev/null; then chmod +x $3 else echo "Syntax wrong in $3." fi bash测试之文件测试: 操作符 文件路径 -f: 测试其是否为普通文件,即ls -l时文件类型为-的文件; ...
在xshell下,用notepad++写了个简单的shell脚本,内容如下: 1#!/bin/bash23if["X$force"="X1"];then45echo167elif["X$force"="X2"];then89echo21011elif["X$force"="X3"];then1213echo31415else1617echo41819fi 运行报错:syntax error near unexpected token `elif' ...
else Command fi 别忘了这个结尾 if语句忘了结尾fi test.sh:line 14: syntax error: unexpected end of fi if的三种条件表达式 if command then if 函数 then 命令执行成功,等于返回0(比如grep ,找到匹配) 执行失败,返回非0(grep,没找到匹配) if[ expression_r_r_r ] ...
/bin/bash# Description:Syntax rightif[$1-eq0];thenechohelloelseechoworldfi# 这次创建一个正确的脚本,用来检查是否给该脚本添加了执行权限 1. 2. 3. 4. 5. 6. 7. 8. [root@localhost ~]# ls -l /tmp/f.sh -rwxr-xr-x.1root root94Jul1207:40 /tmp/f.sh# 可以看到f.sh这个文件已经有...
1.1 if格式 if condition; then commands; fi 1.2 else if 和 else if condition; then...
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 …….. ...