Command not detected -> roscd: command not found

Question

Many commands like roscd, rosls, roslaunch are not working. Errors are thrown as :- roscd: command not found

What may be the reasons behind this?

Answer 1

It seems that your setup.bash hasn't been sourced in a terminal window.

Try executing this command:

source /opt/ros/hydro/setup.bash

If that won't work try following the steps on site bellow, as they are beautifully explained on how to install ROS on Ubuntu.

http://wiki.ros.org/groovy/Installation/Ubuntu#groovy.2BAC8-Installation.2BAC8-DebEnvironment.Environment_setup