How to automatically add new path to $PATH variable after RPM packet installation?

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http://unix.stackexchange.com – I want to automatically add a new path to the $PATH variable each time when my RPM package is installed. I tried to use a post installation script in the my RPM. Here is the part of RPM spec file containing this post installation script: %post PATH=$PATH:/usr/app/mdg/bin export PATH But after successful installation the $PATH doesn't changed. Please help me with that issue. (HowTos)