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Full Discussion: change
Homework and Emergencies Homework & Coursework Questions change Post 302357331 by ripat on Tuesday 29th of September 2009 11:09:38 AM
Old 09-29-2009
There are two things, the number of tries and the running clock. The -t option of the read internal command takes care of the timout while the shell wait for the user input.

But you have to implement a general timer that will start as soon as the script starts. For that, use the date function converted in number of seconds since EPOCH. That's the idea. Try this:

Code:
#!/bin/bash
time=60
tries=3
start=$(date +%s)

left=$time
while true;do
    read -t $left -p "Code: " code
    ((tries--))
    left=$(($time-$(date +%s)+start))
    if (( $left<=0 || $tries==0 ));then
        echo "BOOOOM"
        break
    fi
    if [[ "$code" == "boom" ]];then
        echo "Correct. Bomb defused"
        break
    else
        echo "Wrong. Try again. There are $left seconds and $tries tries left."
    fi
done
exit

And.. please use the CODE tags for clarity.
Last edited by ripat; 09-29-2009 at 01:14 PM.. Reason: some fixing
 

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LEARN ABOUT DEBIAN

rd-bomb

rd-bomb(6x)							XScreenSaver manual						       rd-bomb(6x)

NAME

       rd-bomb - reaction/diffusion textures

SYNOPSIS

       rd-bomb	[-display  host:display.screen]  [-foreground  color] [-background color] [-window] [-root] [-install] [-visual visual] [-width n]
       [-height n] [-reaction n] [-diffusion n] [-size f] [-speed f] [-delay millisecs] [-fps]

DESCRIPTION

       The rd-bomb program draws reaction/diffusion textures.  The code is derived from the 'd' mode of the "bomb" visual musical instrument  (see
       http://www.cs.cmu.edu/~spot/bomb.html).	 I  got the equations from xmorphia (http://www.ccsf.caltech.edu/ismap/image.html), which is based
       on a version of the Gray-Scott model taken from:
	   John E. Pearson "Complex Patterns in a Simple System"
	   Science, 261,189, 9 July 1993.

       If the frame-rate is too low, consider decreasing the width and height of the tile, or decreasing the  size  of	the  active  part  of  the
       screen.

OPTIONS

       If  one of the reaction, diffusion, radius, and palette options is set to a negative value, then that option will be set to a random appro-
       priate value.

       Be sure to try "-speed 1 -size 0.1 -epoch 3000".

       rd-bomb accepts the following options:

       -window Draw on a newly-created window.	This is the default.

       -root   Draw on the root window.

       -install
	       Install a private colormap for the window.

       -visual visual
	       Specify which visual to use.  Legal values are the name of a visual class, or the id number (decimal or hex) of a specific visual.

       -width n

       -height n
	       Specify the size of the tile, in pixels.

       -reaction n

       -diffusion n
	       These are constants in the equations that effect its visual nature.  Each may be one of 0, 1, or 2. Default is -1: these  constants
	       are chosen randomly.

       -radius n
	       Size of the seed.

       -size f What fraction of the window is actively drawn, a floating point number between 0 (exclusive) and 1 (inclusive).	Default is 1.0.

       -speed f
	       When a fraction of the screen is active, the active area moves at this rate (a floating point number).  Default is zero.  Suggested
	       value: 1.0.

       -delay millisecs
	       How many milliseconds to delay between frames; default 1, or about 1/1000th of a second.

       -fps    Display the current frame rate and CPU load.

ENVIRONMENT

       DISPLAY to get the default host and display number.

       XENVIRONMENT
	       to get the name of a resource file that overrides the global resources stored in the RESOURCE_MANAGER property.

SEE ALSO

       X(1), xscreensaver(1), xlock(1)

COPYRIGHT

       Copyright (C) 1997 by Scott Draves.

       Permission to use, copy, modify, and distribute this software and its documentation for any purpose and without fee is hereby granted, pro-
       vided  that  the  above copyright notice appear in all copies and that both that copyright notice and this permission notice appear in sup-
       porting documentation.

AUTHOR

       Scott Draves <spot@cs.cmu.edu>, 9/97

X Version 11							5.15 (28-Sep-2011)						       rd-bomb(6x)
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