没有太多可以说的，直接列脚本：

[root@oracle-cluster-3 shell]# cat var_gen.sh 

var_list="a b c"
var_init_value=1

for var_item in $var_list
do
        eval loop_var_name="$var_item"
        eval $loop_var_name=$var_init_value

        eval echo "current variable is: '$'$loop_var_name, value is: \$$loop_var_name"

        if [ `eval echo '$'$loop_var_name` -eq 2 ]
        then
                echo "item is 2"
        fi


        let var_init_value++

        echo ""

done
[root@oracle-cluster-3 shell]# 
[root@oracle-cluster-3 shell]# sh var_gen.sh 
current variable is: $a, value is: 1

current variable is: $b, value is: 2
item is 2

current variable is: $c, value is: 3

[root@oracle-cluster-3 shell]#

另一个脚本：

[root@oracle-cluster-3 shell]# cat check_var.sh 
  eval func_var_name='$1'
  eval func_var_purpose_value='$2'

eval echo "current variable is: '$'$func_var_name, value is: \$$func_var_name"
echo "func_var_purpose_value=$func_var_purpose_value"

  if [ "`eval echo '$'$func_var_name`" == "" ]
  then
    eval func_var_name="func_var_purpose_value"
    eval echo "current variable is: $func_var_name, value is: \$$func_var_name"
  fi
[root@oracle-cluster-3 shell]# 
[root@oracle-cluster-3 shell]# sh check_var.sh i_am_variable "hello world"
current variable is: $i_am_variable, value is:
func_var_purpose_value=hello world
current variable is: func_var_purpose_value, value is: hello world
[root@oracle-cluster-3 shell]#

另一个脚本：

[root@oracle-cluster-3 shell]# cat check_func_variable.sh

a=56

function variable_if_null_then() {
  eval loop_var_name="$1"
  #eval $loop_var_name="$2"

  eval echo "current variable is: '$'$loop_var_name, value is: \$$loop_var_name"

  if [ `eval echo '$'$loop_var_name` -ne "$2" ]
  then
          eval $loop_var_name="$2"
          echo "-----> after change"
          eval echo "current variable is: '$'$loop_var_name, value is: \$$loop_var_name"
  fi
}

variable_if_null_then a 70

echo "-------"
echo "variable [a] is: $a"
[root@oracle-cluster-3 shell]# 
[root@oracle-cluster-3 shell]# sh check_func_variable.sh
current variable is: $a, value is: 56
-----> after change
current variable is: $a, value is: 70
-------
variable [a] is: 70
[root@oracle-cluster-3 shell]#

——————————
Done。