问题
While playing around with bash and sh, I found out that the following is valid in bash:
system.out.println () { printf "$1"; }
but not in 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?
回答1:
It's just the dots, you can't use dots in shell function names. Or any variable name, for that matter.
I'll link you to this question: Allowed characters in linux environment variable names
来源：https://stackoverflow.com/questions/20771743/function-name-valid-in-bash-but-not-in-sh