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Full Discussion: Variable variables
Top Forums Shell Programming and Scripting Variable variables Post 302790439 by Corona688 on Friday 5th of April 2013 11:17:05 AM
Old 04-05-2013
A modern shell will let you dereference a string with ${!...}

You must assign the string first, you can't embed the string inside the {}

Code:
STR="${MONTH}_${DAY}_${YEAR}"

echo "${!STR}"

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Types(3)						User Contributed Perl Documentation						  Types(3)

NAME
Mac::Types - Macintosh Toolbox Types and conversions. DESCRIPTION
Access to Inside Macintosh is essential for proper use of these functions. Explanations of terms, processes and procedures are provided there. Any attempt to use these functions without guidance can cause severe errors in your machine, including corruption of data. You have been warned. Functions MacPack [ CONVERTERS ...] CODE, DATA ... Convert a perl value into a Mac toolbox type. Predefined codes are: TEXT Text (an identity operation). enum type keyw A 4-byte string. bool A boolean. shor A short integer. long A long integer. sing A single precision float. doub A double precision float. magn An unsigned long. qdrt A QuickDraw "Rect". 'STR ' A pascal style string. 'STR#' A string list. 'fss ' A file specification record. You can pass further code mappings as hash references. MacUnpack [ CONVERTERS ...] CODE, DATA Convert a Mac toolbox type into a perl value. Predefined codes are as for "MacPack". You can pass further code mappings as hash references. XS Functions Debugger [ MSG ] Break into MacsBug. Don't use this if you don't know what MacsBug is. AUTHOR
Written by Matthias Ulrich Neeracher <neeracher@mac.com>. Currently maintained by Chris Nandor <pudge@pobox.com>. perl v5.18.2 2017-10-06 Types(3)
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