run needed erlang version with kerl

.bashrc

# add this function to the .bashrc or .bash_profile 
# change paths to your own paths. i recommend create a dedicated folder for otp versions

# Usage 
#λ kunthar : erl_run
#checking installed versions in /Users/kunthar/development/erlang/kerl
#17.0 17.0-rc2 R15B01 R16B02 README.md bash_completion kerl* releases zsh_completion
#versions will be listed from the same directory!!!
#select one my friend


 . /Users/kunthar/development/erlang/kerl/17.0/activate #change the activation path too

function erl_run()
{
        echo "checking installed versions in /Users/kunthar/development/erlang/kerl"
        echo `ls -l  /Users/kunthar/development/erlang/kerl | awk '{print $9}' | cut -f1 -d'/'`
        echo "select one my friend"
        read input_variable

        if [ -z "$input_variable" ]
          then
                  echo "$(tput setaf 3) Release 17.0 selected as default"
                  echo $(tput sgr 0)
                . /Users/kunthar/development/erlang/kerl/17.0/activate
                erl
        else
                echo "$(tput setaf 2) Release $input_variable selected "
                echo $(tput sgr 0)
                . /Users/kunthar/development/erlang/kerl/$input_variable/activate
                erl
        fi
}