Problema no Bash

[mateusvile]

Eu tava tentando instalar o programa Network Simulator
e precisava mexe no ~/.bashrc

ai em uma dessas mechidas deu pau total no meu terminal
nenhum comando funciona...
por exemplo:

mateus@mateus-laptop:~$ sudo -i
Command 'mesg' is available in '/usr/bin/mesg'
The command could not be located because '/usr/bin' is not included in the PATH environment variable.
-bash: mesg: command not found



root@mateus-laptop:~# ls
Command 'ls' is available in '/bin/ls'
The command could not be located because '/bin' is not included in the PATH environment variable.
-bash: ls: command not found



Alguem pode me ajuda??? PORFAVOR!

[Felix]

copie e cole o conteúdo do seu .bashrc para que possamos tentar ajudar, por favor.