Published: 4. 3. 2010 Category: GNU/Linux
Mandelbrot set computed in BASH
The following 512 bytes shell script counts and display Mandelbrot set on standard Linux/ANSI terminal.
Copy and paste following code to the text console:
#!/bin/sh
S0=S;S1=H;S2=E;S3=L;S4=L;e=echo;b=bc;I=-1;for x in {1..24};
do R=-2;for y in {1..80};do B=0;r=0;i=0;while [ $B -le 32 ];do
r2=`$e "$r*$r"|$b`;i2=`$e "$i*$i"|$b`;i=`$e "2*$i*$r+$I"|$b`;
r=`$e "$r2-$i2+$R"|$b`;: $((B+=1));V=`$e "($r2 +$i2)>4"|$b`;
if [ "$V" -eq 1 ];then break;fi;done; if [ $B -ge 32 ];then
$e -n " ";else U=$(((B*4)/15+30));$e -en "\E[01;$U""m";C=$((C%5));
eval "$e -ne \$E\$S$C";: $((C+=1));fi;R=`$e "$R+0.03125"|$b`
done;$e -e "\E[m\E(\r";I=`$e "$I+0.08333"|$b`;done #(c)BruXy
The computing is quite slow, because there is bc called for floating point operations.
If you do not want spent a lot of machine time try this command:
exec 3<>/dev/tcp/bruxy.regnet.cz/80
echo -e "GET http://bruxy.regnet.cz/linux/mandel/mandel.ansi HTTP/1.0\n" >&3
cat <&3
This code (in GNU/Linux) opens TCP connection to this web site on port 80 (HTTP) with the file descriptor number 3. Then HTTP command GET is send to the address and the port and output of 3 is displayed on the standard output with cat.