Knowledge base → Bash script Christmas tree

A Christmas tree script that runs in the Linux bash console. Create a tree.sh file in the Linux console with the following content:

#!/bin/bash
trap "tput reset; tput cnorm; exit" 2
clear
tput civis
lin=2
col=$(($(tput cols) / 2))
c=$((col-1))
est=$((c-2))
color=0
tput setaf 2; tput bold

#Tree
for ((i=1; i<20; i+=2))
{
     tput cup $lin $col
     for ((j=1; j<=i; j++))
     {
         echo -n \*
     }
     let lin++
     let col--
}

tput sgr0; tput setaf 3

#Trunk
for ((i=1; i<=2; i++))
{
     tput cup $((lin++)) $c
     echo 'mWm'
}
new_year=$(date +'%Y')
let new_year++
tput setaf 1; tput bold
tput cup $lin $((c - 6)); echo MERRY CHRISTMAS
tput cup $((lin + 1)) $((c - 10)); echo And lots of CODE in $new_year
let c++
k=1

# Lights and decorations
while true; do
     for ((i=1; i<=35; i++)) {
         # Turn off the lights
         [ $k -gt 1 ] && {
             tput setaf 2; tput bold
             tput cup ${line[$[k-1]$i]} ${column[$[k-1]$i]}; echo \*
             unset line[$[k-1]$i]; unset column[$[k-1]$i] # Array cleanup
         }

         li=$((RANDOM % 9 + 3))
         start=$((c-li+2))
         co=$((RANDOM % (li-2) * 2 + 1 + start))
         tput setaf $color; tput bold # Switch colors
         tput cup $li $co
         echo o
         line[$k$i]=$li
         column[$k$i]=$co
         color=$(((color+1)%8))
         # Flashing text
         sh=1
         for l in C O D E
         do
             tput cup $((lin+1)) $((c+sh))
             echo $l
             let sh++
             sleep 0.01
         done
     }
     k=$((k % 2 + 1))
done

Let's assign rights and run:

chmod +x tree.sh
./tree.sh

Original script https://github.com/military1/ChristBASHTree