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Full Discussion: Loop through array of arrays of string with spaces
Top Forums Shell Programming and Scripting Loop through array of arrays of string with spaces Post 302697277 by alister on Thursday 6th of September 2012 11:29:02 AM
Old 09-06-2012
Quote:
Originally Posted by kidmanos
I'm trying to loop through an array that contains other arrays and these arrays consist of strings with spaces. The problem is that I can't seem to preserve the spacing in the string.
Code:
#! /bin/sh
low1=("AA  QQ" "BB  LL")
low2=("CC" "DD")
low3=("EE" "FF")
high=(low1 low2 low3)

for high_item in ${high[@]}
do
   eval arrayz=\${$high_item[@]}
   #IFS=$'\n'
   for item in $arrayz
   do
      echo $item
   done
done

... <snip> ...

Any ideas?
Yes. I would simplify the approach. If you're going to hardcode the names of the arrays, then you lose nothing by hardcoding the expansion of those arrays.

Code:
low1=("AA  QQ" "BB  LL")
low2=("CC" "DD")
low3=("EE" "FF")
high=("${low1[@]}" "${low2[@]}" "${low3[@]}")

for i in "${high[@]}"
do
      echo "$i"
done

A couple other suggestions:
1. On many systems, /bin/sh does not support arrays. Nor does it support that $'\n' string syntax. If a script depends on bash (or other non-/bin/sh shell), it's a good idea to state it explicitly at the start of the script. It's preferable to fail loudly (with an interpreter not found message) than to chug along with syntax errors (or worse, silent errors) while using the wrong interpreter.
2. echo "$data" can be problematic if $data ever resembles a command option. Better to use printf '%s\n' "$data".

Regards,
Alister
Last edited by alister; 09-06-2012 at 12:37 PM..
 

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LEARN ABOUT PHP

array_intersect

ARRAY_INTERSECT(3)							 1							ARRAY_INTERSECT(3)

array_intersect - Computes the intersection of arrays

SYNOPSIS

       array array_intersect (array  $array1, array  $array2, [array  $...])

DESCRIPTION

       array_intersect(3)  returns  an	array  containing all the values of $array1 that are present in all the arguments. Note that keys are pre-
       served.

PARAMETERS

	      o $array1
		- The array with master values to check.

	      o $array2
		- An array to compare values against.

	      o $...
		- A variable list of arrays to compare.

RETURN VALUES

	Returns an array containing all of the values in $array1 whose values exist in all of the parameters.

EXAMPLES

       Example #1

	      array_intersect(3) example

	      <?php
	      $array1 = array("a" => "green", "red", "blue");
	      $array2 = array("b" => "green", "yellow", "red");
	      $result = array_intersect($array1, $array2);
	      print_r($result);
	      ?>

	      The above example will output:

	      Array
	      (
		  [a] => green
		  [0] => red
	      )

NOTES

       Note

	       Two elements are considered equal if and only if (string) $elem1 === (string) $elem2. In words: when the string	representation	is
	      the same.

SEE ALSO

       array_intersect_assoc(3), array_diff(3), array_diff_assoc(3).

PHP Documentation Group 													ARRAY_INTERSECT(3)
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