type demo

bash-4.2$ echo $SHELL
/bin/bash

bash-4.2$ help type
type: type [-afptP] name [name ...]
    Display information about command type.

    For each NAME, indicate how it would be interpreted if used as a
    command name.

    Options:
      -a        display all locations containing an executable named NAME;
        includes aliases, builtins, and functions, if and only if
        the `-p' option is not also used
      -f        suppress shell function lookup
      -P        force a PATH search for each NAME, even if it is an alias,
        builtin, or function, and returns the name of the disk file
        that would be executed
      -p        returns either the name of the disk file that would be executed,
        or nothing if `type -t NAME' would not return `file'.
      -t        output a single word which is one of `alias', `keyword',
        `function', `builtin', `file' or `', if NAME is an alias, shell
        reserved word, shell function, shell builtin, disk file, or not
        found, respectively

    Arguments:
      NAME      Command name to be interpreted.

    Exit Status:
    Returns success if all of the NAMEs are found; fails if any are not found.

bash-4.2$ type type
type is a shell builtin

bash-4.2$ type git
git is /usr/bin/git

bash-4.2$ git --version
git version 1.8.1.5

bash-4.2$ type git
git is hashed (/usr/bin/git)

bash-4.2$ type ls
ls is aliased to `/usr/bin/ls $LS_OPTIONS'