函数名在 bash 中有效但在 sh 中无效
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Function name valid in bash but not in sh
提问by user2064000
While playing around with bash and sh, I found out that the following is valid in bash:
在玩 bash 和 sh 时，我发现以下内容在 bash 中有效：
system.out.println () { printf ""; }
but not in sh:
但不是在 sh：
sh: `system.out.println': not a valid identifier
Why would this difference be there? Does the function defined above violate some convention (POSIX etc.) that causes this error?
为什么会有这种差异？上面定义的函数是否违反了导致此错误的某些约定（POSIX 等）？
回答by Noctua
It's just the dots, you can't use dots in shell function names. Or any variable name, for that matter.
这只是点，您不能在 shell 函数名称中使用点。或者任何变量名，就此而言。
I'll link you to this question: Allowed characters in linux environment variable names
我会将您链接到这个问题：Linux 环境变量名称中的允许字符
