while loop variable inclusion

Question

I have the following while loop:

while read LINE; do
  VALUE="`echo $LINE | cut -d"|" -f1`";
done

Notice the f1. This is the normal way I would use cut. This time around though, I need to increment f1 kinda like this:

while read LINE; do
  VALUE="`echo $LINE | cut -d"|" -f$COUNT`";
done

I cannot figure out the correct syntax. Can someone please help me? Thanks!

* UPDATE *

Here is my complete code (if this helps more)

declare -a FIELDS
local i
for i in "${!DBARRAY[@]}"; do
  local COUNT=1
  while read LINE; do
    VALUE="`echo $LINE | cut -d"|" -f$COUNT`";
    FIELDS[$COUNT]="$VALUE"

      Do stuff to each element of array here

    let COUNT=COUNT+1
  done < <(grep -v '#' databases/${DBARRAY[$i]})
done

* UPDATE *

Ok so I just realized my logic was flawed. The first for loop is to loop through all the databases. The while loop is to loop through every line in a single database. I needed a third loop to store each field to the array. See updated code below:

declare -a FIELDS
local i
local j
for i in "${!DBARRAY[@]}"; do
  local COUNT=1
  while read LINE; do
    for (( j=1; j<=24; j++ )); do
      VALUE="`echo $LINE | cut -d"|" -f"$j"`";
      FIELDS[$j]="$VALUE"
      echo "${FIELDS[$j]}"
    done
    let COUNT=COUNT+1
  done < <(grep -v '#' databases/${DBARRAY[$i]})
done

This code works woot!

glenn jackman · Accepted Answer · 2014-01-17 18:03:42Z

1

You can use the read command itself to split the line:

for i in "${!DBARRAY[@]}"; do
    while IFS='|' read -ra FIELDS; do
        printf "%s\n" "${FIELDS[@]}"
    done < <(grep -v '#' databases/${DBARRAY[$i]})
done

http://www.gnu.org/software/bash/manual/bashref.html#index-read

edited Jan 17, 2014 at 18:03

answered Jan 17, 2014 at 17:57

glenn jackman

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Atomiklan · Accepted Answer · 2014-01-17 18:01:08Z

0

Ok so I just realized my logic was flawed. The first for loop is to loop through all the databases. The while loop is to loop through every line in a single database. I needed a third loop to store each field to the array. See updated code below:

declare -a FIELDS
local i
local j
for i in "${!DBARRAY[@]}"; do
  local COUNT=1
  while read LINE; do
    for (( j=1; j<=24; j++ )); do
      VALUE="`echo $LINE | cut -d"|" -f"$j"`";
      FIELDS[$j]="$VALUE"
      echo "${FIELDS[$j]}"
    done
    let COUNT=COUNT+1
  done < <(grep -v '#' databases/${DBARRAY[$i]})
done

This code works woot!

answered Jan 17, 2014 at 18:01

Atomiklan

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