How to change default anaconda env in Unix based system.

default_conda_env.sh

# in ~/.bashrc
# !! Contents within this block are managed by 'conda init' !! 

__conda_setup="$(CONDA_REPORT_ERRORS=false '/home/sam/anaconda3/bin/conda' shel$ 

if [ $? -eq 0 ]; then 

    \eval "$__conda_setup" 

else 

    if [ -f "/home/sam/anaconda3/etc/profile.d/conda.sh" ]; then 

        . "/home/sam/anaconda3/etc/profile.d/conda.sh" 

        CONDA_CHANGEPS1=false conda activate py36           <------------------- here 

    else 

        \export PATH="/home/sam/anaconda3/bin:$PATH" 

    fi 

fi 

unset __conda_setup 

# <<< conda init <<<