type, will help you know if a command, is an alias, a built-in command or an independed command installed in your PC.

With no options, describe a command, for each name, indicate how it would be interpreted if used as a command name. SYNTAX

  type [-atp] [name ...]

OPTIONS

If the -t option is used, type prints a string which is one of alias, keyword, function, builtin, or file if name is an alias, shell reserved word, function, builtin, or disk file, respectively.

  `alias'    (shell alias)
  `function' (shell function)
  `builtin'  (shell builtin)
  `file'     (disk file)
  `keyword'  (shell reserved word) 

If the -p' option is used, type either returns the name of the disk file that would be executed, or nothing if -t’ would not return `file’.

If the -a' option is used, type returns all of the places that contain an executable named file. This includes aliases and functions, if and only if the -p’ option is not also used.

The return status is zero if any of the names are found, non-zero otherwise.

Run

type type

And you will see that type is a bash built-in command.

type is a shell builtin