initial commit

bash/sieve/sieve.sh

@@ -0,0 +1,24 @@
+#!/usr/bin/env bash
+
+usage() {
+    echo "Usage: ./seave.sh <number>"
+    exit 1
+}
+end=$1
+
+[[ ! "$end" =~ ^[[:digit:]]*$ ]] && usage
+
+declare -a numbers
+
+sep=""
+for (( i=2; i<=end; ++i )); do
+    if [[ ${numbers[$i]} == "" ]]; then
+        echo -n "$sep$i"
+        for (( j=i*2; j<=end; j+=i )); do
+            numbers[$j]=t
+        done
+        sep=" "
+    fi
+done
+echo
+exit 0