Pattern49 in Bash

PATTERNS/Pattern49/Pattern49.sh

@@ -0,0 +1,50 @@
+#!/bin/bash
+
+isPrime() {
+    num=$1
+    if [ $num -le 1 ]; then
+        echo 0
+    else
+        for ((i=2; i*i<=num; i++)); do
+            if [ $((num % i)) -eq 0 ]; then
+                echo 0
+                return
+            fi
+        done
+        echo 1
+    fi
+}
+
+printLineOfPrimes() {
+    offset=$1
+    lineDigits=$2
+    max=$3
+
+    if [ $lineDigits -ge $max ]; then
+        return
+    fi
+
+    primesInThisLine=0
+    space=$((max - lineDigits))
+
+    for ((i=0; i<space; i++)); do
+        echo -n "  "
+    done
+
+    while [ $primesInThisLine -lt $lineDigits ]; do
+        if [ $(isPrime $offset) -eq 1 ]; then
+            echo -n "$offset  "
+            ((primesInThisLine++))
+        fi
+
+        ((offset++))
+    done
+
+    echo
+    printLineOfPrimes $offset $((lineDigits+1)) $max
+}
+
+echo -n "Enter the number of lines N : "
+read n
+
+printLineOfPrimes 1 1 $((n+1))