indirection

How can I make this code work? #!/bin/bash ARRAYNAME='FRUITS' FRUITS=( APPLE BANANA ORANGE ) for FRUIT in ${!ARRAYNAME[@]} do echo ${FRUIT} done This code: echo ${!ARRAYNAME[0]} Prints APPLE . I'm tryng to do something similar but with "[@]" to iterate over the array. Thanks in advance, ${!ARRAYNAME[@]} means "the indices of ARRAYNAME ". As stated in the bash man page since ARRAYNAME is set, but as a string, not an array, it returns 0 . Here's a solution using eval . #!/usr/bin/env bash ARRAYNAME='FRUITS' FRUITS=( APPLE BANANA ORANGE ) eval array=\( \${${ARRAYNAME}[@]} \) for fruit in "${array

I am trying to create a constant name dynamically and then get at the value. define( CONSTANT_1 , "Some value" ) ; // try to use it dynamically ... $constant_number = 1 ; $constant_name = ("CONSTANT_" . $constant_number) ; // try to assign the constant value to a variable... $constant_value = $constant_name; But I find that $constant value still contains the NAME of the constant, and not the VALUE. I tried the second level of indirection as well $$constant_name But that would make it a variable not a constant. Can somebody throw some light on this? http://dk.php.net/manual/en/function.constant

Is there a way to use placeholders in yaml like this: foo: &FOO <<propname>>: type: number default: <<default>> bar: - *FOO propname: "some_prop" default: "some default" Context YAML version 1.2 user wishes to include variable placeholders in YAML Problem YAML does not natively support variable placeholders Anchors and Aliases do allow for some level of abstraction and indirection, but these do not work as variable placeholders that can be inserted into arbitrary regions throughout the YAML text. They must be placed as separate YAML nodes There are some add-on libraries that support arbitrary