The below command set the environment for the current session only. Once the terminal is closed the environment variables need to set again for new session.
export PATH=$PATH:/usr/local/sbin:/usr/sbin:/sbin:/usr/local/bin:/usr/bin:/bin:/home/ubuntu/EasyARM/work/crosstool/mini2440/usr/local/arm/4.3.2/bin
Similarly the path varies from other toolchains.