-bash: : command not found SOLVED!

Well, i just a novice at OS X and doing some installation of Android *it should be easy. I followed this tutorial, "how-to-install-the-android-sdk-onto-apples-os-x-lion" but i don't Unzip it and deposit it into your home directory (~/). Instead, i unzip it at /Volumes/Data/Android/android-sdk-macosx and unfortunately i change my environment variable on .bash_profile, which is the source of my bash error now.

Last login: Wed Feb 27 10:14:02 on ttys000
Marias-MacBook-Pro:~ mariabina07$ sudo bash
-bash: sudo: command not found
Marias-MacBook-Pro:~ mariabina07$ ls
-bash: ls: command not found
Marias-MacBook-Pro:~ mariabina07$ 

I got that kind of error for a basic command, i scare myself to death!! Fortunately, i found this http://stackoverflow.com/questions/8910783/sudo-wont-work-after-change-mistake-in-path-env. I followed it and finally i can run my android now.

Marias-MacBook-Pro:~ mariabina07$ PATH=$PATH:/usr/bin
Marias-MacBook-Pro:~ mariabina07$ export "PATH=$PATH:/usr/local/bin"
Marias-MacBook-Pro:~ mariabina07$ sudo bash
Password:sudo: bash: command not found
Marias-MacBook-Pro:~ mariabina07$ android 

But, it got back to the first problem when i open a new terminal and still i can't be root sudo: bash: command not found. it does shock me to death!!! Finally i end up with fill nothing on .bash_profile, and "android" can't recognised again. 
But now i started from scratch followed this :  setting-android-and-path-environment-variables-on-mac-os-x, from here i know that the setting of environment path is on .profile. And this is a good explanation about environment variable os_x_change_path_environment_variable.