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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:
amit14august
 

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LEARN ABOUT SUSE

dm

DM(8)							    BSD System Manager's Manual 						     DM(8)

NAME

     dm -- dungeon master

SYNOPSIS

     ln -s dm game

DESCRIPTION

     dm is a program used to regulate game playing.  dm expects to be invoked with the name of a game that a user wishes to play.  This is done by
     creating symbolic links to dm, in the directory /usr/games for all of the regulated games.  The actual binaries for these games should be
     placed in a ``hidden'' directory, /usr/lib/games/dm, that may only be accessed by the dm program.	dm determines if the requested game is
     available and, if so, runs it.  The file /etc/dm.conf controls the conditions under which games may be run.

     The file /etc/nogames may be used to ``turn off'' game playing.  If the file exists, no game playing is allowed; the contents of the file
     will be displayed to any user requesting a game.

FILES

     /etc/dm.conf	   configuration file
     /etc/nogames	   turns off game playing
     /usr/lib/games/dm	   directory of ``real'' binaries
     /var/games/games.log  game logging file

SEE ALSO

     dm.conf(5)

HISTORY

     The dm command appeared in 4.3BSD-Tahoe.

SECURITY CONSIDERATIONS

     Two issues result from dm running the games setgid ``games''.  First, all games that allow users to run UNIX commands should carefully set
     both the real and effective group ids immediately before executing those commands.  Probably more important is that dm never be setgid any-
     thing but ``games'' so that compromising a game will result only in the user's ability to play games at will.  Secondly, games which previ-
     ously had no reason to run setgid and which accessed user files may have to be modified.

BSD
								   May 31, 1993 							       BSD
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