Configure by modifying the ~ /. Bashrc file in the user directory:

vim ~/.bashrc

# add in the last line
export PATH=$PATH:/home/uusama/mysql/bin

matters needing attention:

Effective time: it takes effect when a new terminal is opened with the same user, or it takes effect manually source ~ /. Bashrc

Effective period: permanent

Effective range: only valid for the current user

If a subsequent environment variable loading file overwrites the Path definition, it may not take effect