bash 연관 배열이고 문자열인자를 썼을때 인자 추출법 질문

# Hello World Program in Bash Shell
 
 
 
declare -A data_arr
declare -A test_arr
 
declare -i d_in_time_s=10;
declare -i d_in_station=20;
declare -i d_out_station=30;
 
declare -i d_AA=10;
declare -i d_BB=20;
 
 
#Numeric indexing
#https://www.artificialworlds.net/blog/2012/10/17/bash-associative-array-examples/
 
declare -A MYMAP=( [go1 go2 go3]=one [go4 go5 go6]=two )
KEYS=(${!MYMAP[@]})        # Make a normal array containing all the keys in the associative array
echo ${KEYS[0]}            # Find a key via an index
echo ${KEYS[1]}            # Find a key via an index
echo ${KEYS[2]}            # Find a key via an index
echo ${KEYS[3]}            # Find a key via an index
echo ${KEYS[4]}            # Find a key via an index
echo ${KEYS[5]}            # Find a key via an index
echo ${MYMAP[${KEYS[0]}]}  # Find a value via an index
echo ${KEYS[@]}            # Find a key via an index
 
# Loop through using an index
for (( I=0; $I < ${#MYMAP[@]}; I+=1 )); 
  do KEY=${KEYS[$I]};  
  echo $KEY --- ${MYMAP[$KEY]}; 
done
 
#echo ${test_arr}
#-------------------------------------------------------------
 
#https://stackoverflow.com/questions/3112687/how-to-iterate-over-associative-arrays-in-bash
for i in "${!test_arr[@]}"
do
  echo "key  : $i"
  echo "value: ${test_arr[$i]}"
done
 
#-------------------------------------------------------------
 #updown_arr[]배열 생성 - r_updown 에 입력
 r_updown=${updown_arr[$d_in_station, $d_out_station]};
 
 #시간 생성
 d_in_time_m=${d_in_time_s:0:12};
 
 #출력
 echo "$d_in_time_m, $d_in_station, $d_out_station, $r_updown";
 
#data_arr 생성 x$에서 사용 == x 와 같으면.
if [ x${data_arr[$d_in_station,$r_updown,$d_in_time_m]} == x ];
 then
 #data_arr[] = 1
 data_arr[$d_in_station,$r_updown,$d_in_time_m]=1;
 else
 #다르면.
 #r_data 에 data_arr[] 입력
 r_data=${ data_arr[$d_in_station,$r_updown,$d_in_time_m]};
 #data_arr[] 는 expr $r_data+1
 data_arr[$d_in_station,$r_updown,$d_in_time_m]=`expr $r_data + 1`;
fi
 
echo ${data_arr[@]}