Linux World: Creating a christmas tree on linux terminal

Here is a script that,when executed, will draw a christmas tree using the characters choosen by the user on the linux terminal.

The script will prompt the user to enter the character using which the tree has to be drawn. Then it will prompt the user to enter two characters that will be used to decorate the tree. The last input it will ask for is the character using which the base of the tree has to be drawn.

chritstmas_tree.sh

#!/bin/bash

trapi() {

cols=`tput cols`
start=$((cols/2))
# char="*"
char="$3"
rows=$1
rows=$((rows+5))
# tput clear
for((i=$1;i<$rows;i++))
do

deco1=$(($RANDOM % rows))
deco2=$((RANDOM % rows))
cols=$((start-i-$2))
tput cup $i $cols

#printf "$char" 
for((j=0;j<=(i+$2);j++))
do

if [ $i -eq $((rows-1)) ]
then
printf "$char "

elif [ $j -eq 0 ]
then
 printf "$char "
else

if [ $j -eq $((i+$2)) ]
 then
  printf "$char "
 else
  if [ $j -eq $deco1 ]
  then
  printf "$4 "
  elif [ $j -eq  $deco2 ]
  then 
  printf "$5 "
  else
  printf "  "
  fi
 fi

done
done
echo""
}

triangle() {
cols=`tput cols`
start=$((cols/2))
#echo "How many rows do you want"
#read rows
#echo "What character do you want to use"
#read char

rows=5
# char="*"
char="$1"

tput clear
for((i=0;i<rows;i++))
do 
cols=$((start-i))
tput cup $i $cols
deco=$(($RANDOM%rows))
#printf "$char" 
for((j=0;j<=i;j++))
do

if [ $i -eq $((rows-1)) ]
then
printf "$char "

elif [ $j -eq 0 ]
then
 printf "$char "
else

if [ $j -eq $i ]
 then
  printf "$char "
 else
  if [ $j -eq $deco ]
  then 
  printf "$2 "
  else
  printf "  "
  fi
 fi

done
done
echo""
# sleep 5 
}

base() {

cols=`tput cols`
start=$((cols/2))
#char="*"
rows=5
char="$2"

# tput clear
for((i=0;i<5;i++))
do 
cols=$((start-i-2))
tput cup $(($1+i)) $cols

#printf "$char" 
for((j=0;j<=(i+2);j++))
do

if [ $i -eq $((rows-1)) ]
then
printf "$char "

elif [ $j -eq 0 ]
then
 printf "$char "
else

if [ $j -eq $((i+2)) ]
 then
  printf "$char "
 else
 printf "  "
 fi

done
done
echo""
}

echo "Enter character for the tree" 
read char 
echo "Enter first decoration character"
read ch_deco1
echo "Enter second decoration character"
read ch_deco2 
echo "Enter character for base" 
read base_char
triangle "$char" "$ch_deco1"
trapi 5 1 "$char" "$ch_deco1" "$ch_deco2"
trapi 10 2 "$char" "$ch_deco1" "$ch_deco2"
trapi 15 3 "$char" "$ch_deco1" "$ch_deco2"
base 20 "$base_char"

Save the script as chritstmas_tree.sh and give it execute permissions

You should see the following on your screen.