NGUPLUS

For Loop Example 2

#!/bin/bash
# Usage: forloop2.sh or forloop2.sh number
# Example using for loop
# Prints following format
# *
# * *
# * * *
# * *
# *

n=${1-10} # If command line argument not supplied default is 10
t=`expr $((2*$n - 1 ))`
a=$n
b=$(($a+1))
for (( i=1 ; i<=$n ;i++ ))
do
 echo -e -n "33[47m"
 a=$(($b-1))
 b=$a
 k=1
for (( j=1 ; j<=$t ; j++ ))
 do
 if [ $j -eq $a ]
 then
 echo -e "33[43m * 33[47mc"
 if [ $k -lt $i ]
 then
 a=$((a+2))
 let k++
 fi
 else
 echo -n " "
 fi
 done
 echo ""
done

n=$(($n-1))
a=1
b=$a
for (( i=$n ; i>=1 ;i-- ))
do
 echo -e -n "33[47m"
 a=$(($b+1))
 b=$a
 k=1
 for (( j=1 ; j<=$t ; j++ ))
 do
 if [ $j -eq $a ]
 then
 echo -e "33[43m * 33[47mc"
 if [ $k -lt $i ]
 then
 a=$((a+2))
 let k++
 fi
 else
 echo -n " "
 fi
 done
 echo ""
done
echo -e "33[0m"

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