ERREI o comando do PATH o que faço?

Command 'cat' is available in the following places                                                                                                                      
* /bin/cat                                                                                                                                                              
* /usr/bin/cat                                                                                                                                                         
The command could not be located because '/usr/bin:/bin' is not included in the PATH environment variable.                                                              
cat: command not found