11 Linux Command Line Visual or Audio Tricks (Fun & Learning)

These are for your amusement but you can also learn a lot about scripting and Linux.

Bash or Zsh you make need to install some utilities. espeak,lolcat etc

Video made with kdenlive appimage

1) RAINBOW
rainbow(){ for i in {1..7}; do tput setaf $i; echo $@; tput sgr0; done; }
rainbow hiThere


2) COWSAY
fortune -s | figlet -w $(tput cols) | cowsay -f dragon-and-cow -n -W $(tput cols) | lolcat -a -d 1

3) French Flag
t=$(($(tput cols)/3));for FR in $(seq $(tput lines));do printf "\e[44m%${t}s\e[47m%${t}s\e[41m%${t}s\e[0m\n";done

4) TV SCREEN LINE RANDOM DATA
while true;do printf "$(awk -v c="$(tput cols)" -v s="$RANDOM" 'BEGIN{srand(s);while(--c!=0){printf("\xe2\x96\\%s",sprintf("%o",150+int(10*rand())));}}')";done

5) BROWN NOISE
play -n synth brownnoise synth pinknoise mix synth 0 0 0 15 40 80 trapezium amod 0.2 20

6) TIC TOCK
play -n synth pinknoise 2 pinknoise 1 fade 0 .02 .02 delay 0 +0.5 pad .48 .48 remix - trim 0 1 repeat -

7) PEE CAT
cat /dev/urandom | tr -dc 'a-zA' | fold -w 50 | head -n 40 | pee espeak cat

8) STAR TREK
for voice in {1..3}; do espeak -v en "We are the Borg" & sleep 0.5; done

9) PLAY SCREECH
timeout 3s play -n synth sq C trim 0 4 vol 0.2 chorus 1 1 21 1 4 10 -s bend 0,2400,4 fade 0.1 4 2

10) SIREN
timeout 3s perl -e 'use bytes; for($t=0;;$t++){ print chr($t*(($tzz11|$tzz23)&83&$tzz3)); }' |play -t raw -b8 -r8k -e un - # replace the z's with left angle bracket

11) RED BRICK WALL
tput setaf 1;tput rev;h=$(tput lines);w=$[$(tput cols)/6];c=$(seq -ws '_____|' $[$w+1]|tr -d "0-9");for a in $(seq $[$h/2]);do echo $c;echo ${c//|___/___|};done;tput cup 0;tput cup $h


some others to consider (not shown in the video)


sudo apt install xeyes oneko sl