SHELL

bash if variable is not empty

VAR=`echo Hello world`
if [[ -n "$VAR" ]] ; then echo "Variable is set"  ; fi
if [[ -z "$VAR" ]] ; then echo "Variable is null" ; fi

check if a variable is null in bash

if [[ -n "$list_Data" ]]
then
    echo "not Empty"
else
    echo "empty"
fi