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#!/bin/bash
# array-function.sh: Passing an array to a function and ...
# "returning" an array from a function
Pass_Array ()
{
local passed_array # Local variable!
passed_array=( `echo "$1"` )
echo "${passed_array[@]}"
# List all the elements of the new array
#+ declared and set within the function.
}
original_array=( element1 element2 element3 element4 element5 )
echo
echo "original_array = ${original_array[@]}"
# List all elements of original array.
# This is the trick that permits passing an array to a function.
# **********************************
argument=`echo ${original_array[@]}`
# **********************************
# Pack a variable
#+ with all the space-separated elements of the original array.
#
# Attempting to just pass the array itself will not work.
# This is the trick that allows grabbing an array as a "return value".
# *****************************************
returned_array=( `Pass_Array "$argument"` )
# *****************************************
# Assign 'echoed' output of function to array variable.
echo "returned_array = ${returned_array[@]}"
echo "============================================================="
# Now, try it again,
#+ attempting to access (list) the array from outside the function.
Pass_Array "$argument"
# The function itself lists the array, but ...
#+ accessing the array from outside the function is forbidden.
echo "Passed array (within function) = ${passed_array[@]}"
# NULL VALUE since the array is a variable local to the function.
echo
############################################
# And here is an even more explicit example:
ret_array ()
{
for element in {11..20}
do
echo "$element " # Echo individual elements
done #+ of what will be assembled into an array.
}
arr=( $(ret_array) ) # Assemble into array.
echo "Capturing array \"arr\" from function ret_array () ..."
echo "Third element of array \"arr\" is ${arr[2]}." # 13 (zero-indexed)
echo -n "Entire array is: "
echo ${arr[@]} # 11 12 13 14 15 16 17 18 19 20
echo
exit 0
# Nathan Coulter points out that passing arrays with elements containing
#+ whitespace breaks this example.
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