Bash echo 输出字符串和字符的混合

Question

I am taking an assessment and stumbled across the following sample question, but when I run the line it's none of the options? Which is the correct answer?

Answer 1

. is the string concatenation operator for PHP. In bash, you could just do echo Tomorrow will be January ${num}rd .

Both versions of the code output Tomorrow will be January 3rd .

Answer 2

That code looks more like PHP. . is the concatenation operator, and it can be used with both strings and numbers (it will convert the number to a string). The output will be

Tomorrow will be January 3rd

In bash , . has no special meaning, so it will be echoed literally. The echo command puts a space between each argument, so the output will be

Tomorrow .  will be January  . 3 . rd