在自定义外壳中标记参数

Question

I have quick questions.

I'm creating a basic custom shell, and I have a question regarding token. I tokenize the input string from the user into args[i]

My question is:

$ cd my_file
// means that args[0] is 'cd' and args[1] is 'my_file'

$ ls
// means that args[0] is 'ls' but what is args[1]? Is it NULL or '\0' or what?

what is args[1] in ls? Is it NULL or '\\0' or what?

I'm planning to do a strcmp for the args[i] . thank you

Answer 1

You are implementing the tokenization so it is up to you to define that any way you like. But the standard C argv passed to main has argv[argc] set to NULL if that's what you are asking about. So, for the standard C main , if the command is ls then argv[0] is "ls" and argv[1] is NULL . – kaylum