aliaz function to avoid creating aliases with existing command or aliases names

aliaz.sh

function aliaz
{
 if [ -n "$1" ]
 then
   read COMMAND ALIAS <<<$(IFS="="; echo $1)
   if command -v $COMMAND > /dev/null 2>&1
   then
     echo "The command or alias '$COMMAND' already exists!"
   else
     alias $1
   fi
 else
   alias
 fi
}