View difference between Paste ID: AzAsswjK and b5D65Zj4

 #!/bin/bash
 declare -i  f=75 s=13 r=2000 t=0 c=1 n=0 l=0
 declare -ir w=$(tput cols) h=$(tput lines)
 declare -i  x=$((w/2)) y=$((h/2))
 declare -ar v=(    [00]="\x83" [01]="\x8f" [03]="\x93"
         [10]="\x9b" [11]="\x81" [12]="\x93"
         [21]="\x97" [22]="\x83" [23]="\x9b"
         [30]="\x97" [32]="\x8f" [33]="\x81" )
 
 OPTIND=1
 while getopts "f:s:r:h" arg; do
     case $arg in
     f)    ((f=($OPTARG>19 && $OPTARG<101)?$OPTARG:$f));;
     s)    ((s=($OPTARG>4  && $OPTARG<16 )?$OPTARG:$s));;
     r)    ((r=($OPTARG>0)?$OPTARG:$r));;
     h)    echo -e "Usage: pipes [OPTION]..."
         echo -e "Animated pipes terminal screensaver.\n"
         echo -e "  -f [20-100]\tframerate (D=75)."
         echo -e "  -s [5-15]\tprobability of a straight fitting (D=13)."
         echo -e "  -r LIMIT\treset after x characters (D=2000)."
         echo -e "  -h\t\thelp (this screen).\n"
         exit 0;;
     esac
 done
 
 tput smcup
 tput reset
 tput civis
 while ! read -t0.0$((1000/$f)) -n1; do
     # New position:
     (($l%2))    && ((x+=($l==1)?1:-1))
     ((!($l%2))) && ((y+=($l==2)?1:-1))
 
     # Loop on edges (change color on loop):
     ((c=($x>$w || $x<0 || $y>$h || $y<0)?($RANDOM%7-1):$c))
     ((x=($x>$w)?0:(($x<0)?$w:$x)))
     ((y=($y>$h)?0:(($y<0)?$h:$y)))
 
     # New random direction:
     ((n=$RANDOM%$s-1))
     ((n=($n>1||$n==0)?$l:$l+$n))
     ((n=($n<0)?3:$n%4))
 
     # Print:
     tput cup $y $x
     echo -ne "\033[1;3${c}m\xe2\x94${v[$l$n]}"
     (($t>$r)) && tput reset && tput civis && t=0 || ((t++))
     l=$n
 done
 tput rmcup