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Full Discussion: Snake game challenge in UNIX
The Lounge What is on Your Mind? Snake game challenge in UNIX Post 302996301 by wisecracker on Monday 24th of April 2017 04:16:21 AM
Old 04-24-2017
Hi amit14august...
You must be using a bash version 4.x.x as it cannot be used on anything previous.
On OSX 10.12.4, DEFAULT bash terminal below occurs...
Code:
Last login: Sun Apr 23 09:13:49 on ttys000
AMIGA:amiga~> bash --version
GNU bash, version 3.2.57(1)-release (x86_64-apple-darwin16)
Copyright (C) 2007 Free Software Foundation, Inc.
AMIGA:amiga~> cd Desktop/Code/Shell
AMIGA:amiga~/Desktop/Code/Shell> ./snakegame.sh






Your green snake must stay away from pink ones

control : I = UP  J = LEFT  K = DOWN  L = RIGHT

 Game will start in 3 seconds


your score is : 1      top score is 1000
./snakegame.sh: line 283: declare: -A: invalid option
declare: usage: declare [-afFirtx] [-p] [name[=value] ...]
                                             
                                             
                                             
                                             
                                             
                                             
@@@@@                                        
                                             
                                             
                        ***                  
                                             
                                             
                                             
                                             
                                             
./snakegame.sh: line 221: init_snake: bad array subscript
./snakegame.sh: line 222: init_snake: bad array subscript
./snakegame.sh: line 167: read: .025: invalid timeout specification
./snakegame.sh: line 88: [: -eq: unary operator expected
./snakegame.sh: line 95: init_helper_one: bad array subscript
./snakegame.sh: line 96: init_helper_one: bad array subscript
./snakegame.sh: line 100: 1 -  : syntax error: operand expected (error token is " ")
AMIGA:amiga~/Desktop/Code/Shell> _

So it is not backwards compatible.
To find your bash version:-
Code:
Last login: Mon Apr 24 07:15:34 on console
AMIGA:amiga~> bash --version
GNU bash, version 3.2.57(1)-release (x86_64-apple-darwin16)
Copyright (C) 2007 Free Software Foundation, Inc.
AMIGA:amiga~> _

It is not easy to include users who do not have versions of languages that you write for and possibly unable to upgrade to. So be aware when you write your code to state which version of language you are using as that helps the user to decide whether or not to run your code.
We all learn the hard way.
Good luck and keep up with the programming learning curve.
We look forwards to seeing more from you...

Bazza.
This User Gave Thanks to wisecracker For This Post:
 

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LIBBASH(7)							  libbash Manual							LIBBASH(7)

NAME
libbash -- A bash shared libraries package. DESCRIPTION
libbash is a package that enables bash dynamic-like shared libraries. Actually its a tool for managing bash scripts whose functions you may want to load and use in scripts of your own. It contains a 'dynamic loader' for the shared libraries ( ldbash(1)), a configuration tool (ldbashconfig(8)), and some libraries. Using ldbash(1) you are able to load loadable bash libraries, such as getopts(1) and hashstash(1). A bash shared library that can be loaded using ldbash(1) must answer 4 requirments: 1. It must be installed in $LIBBASH_PREFIX/lib/bash (default is /usr/lib/bash). 2. It must contain a line that begins with '#EXPORT='. That line will contain (after the '=') a list of functions that the library exports. I.e. all the function that will be usable after loading that library will be listed in that line. 3. It must contain a line that begins with '#REQUIRE='. That line will contain (after the '=') a list of bash libraries that are required for our library. I.e. every bash library that is in use in our bash library must be listed there. 4. The library must be listed (For more information, see ldbashconfig(8)). Basic guidelines for writing library of your own: 1. Be aware, that your library will be actually sourced. So, basically, it should contain (i.e define) only functions. 2. Try to declare all variables intended for internal use as local. 3. Global variables and functions that are intended for internal use (i.e are not defined in '#EXPORT=') should begin with: __<library_name>_ For example, internal function myfoosort of hashstash library should be named as __hashstash_myfoosort This helps to avoid conflicts in global name space when using libraries that come from different vendors. 4. See html manual for full version of this guide. AUTHORS
Hai Zaar <haizaar@haizaar.com> Gil Ran <ril@ran4.net> SEE ALSO
ldbash(1), ldbashconfig(8), getopts(1), hashstash(1) colors(1) messages(1) urlcoding(1) locks(1) Linux Epoch Linux
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