Using dynamic arrays to extract the values

Shell Programming and Scripting
1

Hi all,
We have requirement to generate load timing based on subject areas HOUSEHOLD, BANKING and TRADING. These values are stored in an array SUB_ARR

SUB_ARR=("HOUSEHOLD" "BANKING" "TRADING")

Based on indicator files produced while processing data for each type, we need to get the stats (using stats -c "%y") of when file was generated. These file names are again stored in array.

HOUSEHOLD_LIST=("HH1_FILE" "HH2_FILE" "HH3_FILE" "HH4_FILE")

similalry BANKING_LIST and TRADING_LIST

my requirement is dynamically fetch the values of LIST for each SUB_ARR value as below :

for i in ${SUB_ARR[@]}
do
  SUB_LIST=$i'_LIST'   
  <next_code_lines>
done

In next code lines, now my requirement is to fetch the values for <SUB>_LIST and assign it to variables.
eg for first iteration
SUB_LIST=$i'_LIST' would be HOUSEHOLD_LIST.
now i want to extract the value of HOUSEHOLD_LIST[0] and assign it to a varaible by modifying SUB_LIST in some way.
I tried out many ways but unsuccessful.

Would someone please provide any assistance?
Any help is apprecated.

Thanks
Sam

2

Something like this?

for i in ${SUB_ARR[@]}
do
  SUB_LIST=$i'_LIST'
  for j in $(eval echo \${$SUB_LIST[@]})
  do
    echo $j
  done
done

HTH
--ahamed

1 Like
3

THIS WAS INDEED HELPFUL