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Modified Matrix Effect (original from @khakimov)
#!/bin/bash
lines=$(tput lines)
cols=$(tput cols)
awkscript='
{
lines=$1
random_col=$3
letter=$4
cols[random_col]=0;
for (col in cols) {
rnum = int(20*rand());
if (cols[col] < 0) {
line=-cols[col];
cols[col]=cols[col]-1;
subline = -cols[col] + 1
printf "\033[%s;%sH%s", line, col, " ";
printf "\033[%s;%sH%s\033[0;0H", newline, col, " ";
if (actcol >= lines) {
cols[col]=0;
} else if (rnum < 1) {
cols[col]=0
}
} else {
line=cols[col];
cols[col]=cols[col]+1;
if (rnum < 3) {
printf "\033[%s;%sH\033[1;32m%s\033[0m", line, col, letter;
} else {
printf "\033[%s;%sH\033[2;32m%s\033[0m", line, col, letter;
}
printf "\033[%s;%sH\033[37m%s\033[0;0H\033[0m", cols[col], col, letter;
if (cols[col] >= lines) {
if (rnum < 2) {
cols[col]=0
} else {
cols[col]=-1;
}
}
}
}
}
'
echo -e "\e[1;40m"
clear
if [[ -t 0 ]]; then
stty -echo -icanon -icrnl time 0 min 0;
fi
keypress=''
while [ "x$keypress" = "x" ]; do
echo $lines $cols $(( $RANDOM % $cols)) $(( $RANDOM % 2 ))
sleep 0.04
keypress="`cat -v`"
done | awk "$awkscript"
if [[ -t 0 ]]; then
stty sane;
fi
clear
exit 0
@dhaiducek

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@dhaiducek dhaiducek commented Apr 20, 2018

Changes:

  • Runs as a bash command from the command line on my system (by removing extension, placing it in $HOME/bin folder and adding that folder to the .bash_profile)
  • Changed it to display only zeros and ones
  • Exits and clears the screen when any key is pressed
  • Clears out lines from above so that empty spots are always visible
@dhharris

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@dhharris dhharris commented Aug 28, 2019

This is amazing! Thanks for making it :)

@gadget00

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@gadget00 gadget00 commented Nov 5, 2019

I only get a black screen with a single "0" or "1" on the screen. It doesnt keep on writing on the screen.

Im using the Linux subsystem in Win10. Would that be causing this?

@dhaiducek

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@dhaiducek dhaiducek commented Nov 13, 2019

@gadget00 Unfortunately I'm not familiar with the Linux subsystem, but there could be some commands or escape sequences that don't work the same. I wonder: What's the output of tput lines or tput cols?

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@gadget00 gadget00 commented Nov 14, 2019

tput lines: 30

tput cols: 120

@rullinoiz

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@rullinoiz rullinoiz commented Apr 28, 2020

this is epic

@Boddah

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@Boddah Boddah commented Jun 29, 2020

Loved this. Hoping the serial connection to my new (lol) HP 700/96 is quick enough to run it.
Just a quick update to expand from using just 0's and 1's:

8,10c8,12
< lines=$1
< random_col=$3
< letter=$4
---
> lines=$1;
> random_col=$3;
> rand_char=$4;
> charset="abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789@#$%^&*()";
> letter=substr(charset,rand_char,1);
55c57
< echo $lines $cols $(( $RANDOM % $cols)) $(( $RANDOM % 2 ))
---
> echo $lines $cols $(( $RANDOM % $cols)) $(( $RANDOM % 70 ))
65a68
>

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