Using arrays in shell

Shell Programming and Scripting
1

I have three arrays. One is Master array and that has list of other array in config file.
for e.g (for simplicity I have only defined array with 2 elements each)

set +A MASTERARRAY SQLUPDATE_ONETIME SQLUPDATE_DAILY END_OF_ARRAY

set +A SQLUPDATE_ONETIME  update12 update22  END_OF_ARRAY
set +A SQLUPDATE_DAILY  update32 update42 END_OF_ARRAY

I am trying to write a shell script (KSH) to iterate over master array to get the list of array to process (for e.g. SQLUDATE_ONETIME) I need to process one by one. Then go through each element of processing array then do something with it. This is what I have so far.. Any help will be appreciated.

--- Code starts here-----

set +A MASTERARRAY SQLUPDATE_ONETIME SQLUPDATE2_DAILYEND_OF_ARRAY

set +A SQLUPDATE  update12 update22  END_OF_ARRAY
set +A SQLUPDATE2  update32 update42 END_OF_ARRAY
#echo "first  - ${SQLUPDATE[1]}\n"

CTR=0
while [[ ${MASTERARRAY[CTR]} != "END_OF_ARRAY" ]]; do
              echo "Processing ${MASTERARRAY[CTR]} element of an TEMPARRAy\n"
              ELEMENT=${MASTERARRAY[CTR]}
              echo "Processing ${ELEMENT} element of an MASETERARRAY\n"
      FIRSTELEMENT=$(eval echo \$${ELEMENT}[$CTR])
      echo "This  FIRST ELEMENT ${FIRSTELEMENT}\n"

              count=0
              while [[ $(eval echo \$${ELEMENT}[count]) != "END_OF_ARRAY" ]] ;do
                       ELMNT2=$(eval echo \$${ELEMENT}[count])
                       echo "This is the next element of $ELEMENT - <$ELMNT2>\n"
          # do some checking and process the element
                       (( count = count + 1 ))
               done
        (( CTR = CTR + 1 ))
done

I am having trouble going thru arrays listed in Masterarray - Please help

2

Please put code in

```text
...
```

tags.

for element in "${MASTERARRAY[@]}"
do
  case $element in END_OF_ARRAY) break;; esac
  eval "array=( \"\${${element%_*}[@]}\" )"
  printf "\nArray: %s\n" "${element%_*}"
  for e in "${array[@]}"
  do
      case $e in END_OF_ARRAY) break;; esac
      printf "\nArray: %s\n" "$e"
  done
done

(You don't need END_OF_ARRAY elements.)

3

It gives me syntax error

#!/usr/bin/ksh
set +A MASTERARRAY SQLUPDATE SQLUPDATE2 END_OF_ARRAY
set +A SQLUPDATE  update12 update22
set +A SQLUPDATE2  update32 update42
for element in "${MASTERARRAY[@]}"
do
  case $element in END_OF_ARRAY) break;; esac
  eval "array=( \"\${${element%_*}[@]}\" )"
  printf "\nArray: %s\n" "${element%_*}"
  for e in "${array[@]}"
  do
      case $e in END_OF_ARRAY) break;; esac
      printf "\nArray: %s\n" "$e"
  done
done

tt1.sh[8]: syntax error at line 1 : `(' unexpected

4

You must be using ksh88 or pdksh. Try this:

for element in "${MASTERARRAY[@]}"
do
  case $element in END_OF_ARRAY) break;; esac
  eval "set -- \"\${${element%_*}[@]}\" "
  for e
  do
      case $e in END_OF_ARRAY) break;; esac
      printf "\nArray: %s\n" "$e"
  done
done
5

I am assuming I am running ksh88. I don't have KSH_VERSION variable defined.

#!/usr/bin/ksh
set +A MASTERARRAY SQLUPDATE SQLUPDATE2 END_OF_ARRAY
set +A SQLUPDATE_DAILY  update12 update22
set +A SQLUPDATE_ONETIME  update32 update42
for element in "${MASTERARRAY[@]}"
do
  case $element in (END_OF_ARRAY) break;; esac
  eval "set -- \"\${${element}[@]}\" "
  for e
  do
      case $e in (END_OF_ARRAY) break;; esac
      printf "\nArray: %s\n" "$e"
  done
done
  1. I added extra parenthesis in front of END_OF_ARRAY
  2. When I run the script. I don't get any error message but nothing prints