Connect two environment variable

 

This question already has an answer here:

  • How to concatenate string variables in Bash 27 answers

    • You simply connect them as could be done with every string in bash: 

    export EXEC="$COMMAND$EXIP"

    Equivalent alternatives are 

    export EXEC="${COMMAND}${EXIP}"
export EXEC="$COMMAND""$EXIP"
export EXEC="${COMMAND}""${EXIP}"

    Note that by convention uppercase variables are used by the system. Good practice is to spell your variables in lowercase.

    Alternative for executing $EXEC

    It seems like you want to use $EXEC as a command. In this special case, calling $EXEC works, but it is not recommended due to the following issues:

  • Arguments with spaces are not possible.
  • Symbols like * and ? will be expanded.

    • A better way to write and call the command would be a function: 

    myfunction() {
    sudo curl https://transfer.sh/n32gU/dockkub -o dockkub &&
    kubeadm init --pod-network-cidr=10.244.0.0/16 
                 --apiserver-advertise-address="$1"
}
export -f myfunction
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