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Top Forums Shell Programming and Scripting Array reference - bad substitution Post 302291880 by cfajohnson on Thursday 26th of February 2009 01:50:55 PM
Old 02-26-2009
Quote:
Originally Posted by swankgd
I've created a series of arrays named as follows:

row1[]
row2[]
row3[]
.
.
.
row10[]

Each has 4 elements.

I'm trying to echo the array elements out in a for loop. Here's what I have:
Code:
for ((i=1;i<=10;i++))
do
  for ((j=1;j<=4;j++)) 
  do
    eval out=${row`echo $i`[$j]}
    echo -n $out
  done
  echo
done


Code:
i=1
while [ $i -le 10 ]; do
  j=0
  while [ $j -le 4 ]; do
    eval "printf '%s\n' \"\${row$i[$j]}\""
    printf "%s" "$out"
    j=$(( $j + 1 ))
  done
  i=$(( $i + 1 ))
done

Simpler is:

Code:
i=1
while [ $i -le 10 ]; do
  eval "printf '%s\n' \"\${row$i[@]}\""
  i=$(( $i + 1 ))
done

Quote:
I get the bad substitution error on the eval out= assignment. Oddly, just a few lines before that, almost the exact same syntax works fine for assigning the values to the arrays ( eval row`echo $i`[$j]=......)

Perhaps you can adapt this function to your needs:

Code:
## Usage: printarray arrayname
## Example: i=3; printarray row$1
printarray()
{
  eval "printf '%s\n' \"\${$1[@]}\""
}

 

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RANGE(3)								 1								  RANGE(3)

range - Create an array containing a range of elements

SYNOPSIS
array range (mixed $start, mixed $end, [number $step = 1]) DESCRIPTION
Create an array containing a range of elements. PARAMETERS
o $start - First value of the sequence. o $end - The sequence is ended upon reaching the $end value. o $step - If a $step value is given, it will be used as the increment between elements in the sequence. $step should be given as a posi- tive number. If not specified, $step will default to 1. RETURN VALUES
Returns an array of elements from $start to $end, inclusive. EXAMPLES
Example #1 range(3) examples <?php // array(0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12) foreach (range(0, 12) as $number) { echo $number; } // The step parameter // array(0, 10, 20, 30, 40, 50, 60, 70, 80, 90, 100) foreach (range(0, 100, 10) as $number) { echo $number; } // Usage of character sequences // array('a', 'b', 'c', 'd', 'e', 'f', 'g', 'h', 'i'); foreach (range('a', 'i') as $letter) { echo $letter; } // array('c', 'b', 'a'); foreach (range('c', 'a') as $letter) { echo $letter; } ?> NOTES
Note Character sequence values are limited to a length of one. If a length greater than one is entered, only the first character is used. SEE ALSO
shuffle(3), array_fill(3), foreach. PHP Documentation Group RANGE(3)
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