Well if you are using a sh/bash/ksh shell then do the following:
cd <enter>

ls -lrta <enter>

vi .profile

Look for the following line and add the path you want after the :
PATH=$PATH:$HOME/bin:/var/juno/bin:/usr/sbin/ifconfig:

After you save and exit out of your .profile then do the following so you changes can take effect:

source .profile <enter>