readded udpated scripts directory

scripts/valida1num

@@ -0,0 +1,33 @@
+#!/bin/bash
+# validAlphaNum--Ensures that input consists only of alphabetical
+#  and numeric characters
+
+validAlphaNum()
+{
+    # Validate arg: returns 0 if all upper+lower+digits; 1 otherwise
+
+    # Remove all unacceptable chars.
+    validchars="$(echo $1 | sed -e 's/[^[:alnum:]]//g')"
+
+    if [ "$validchars" = "$1" ] ; then
+        return 0
+    else
+        return 1
+    fi
+}
+
+# BEGIN MAIN SCRIPT--DELETE OR COMMENT OUT EVERYTHING BELOW THIS LINE IF
+#  YOU WANT TO INCLUDE THIS IN OTHER SCRIPTS.
+# =================
+/bin/echo -n "Enter input: "
+read input
+
+# Input validation
+if ! validAlphaNum "$input" ; then
+    echo "Please enter only letters and numbers" >&2
+    exit 1
+else
+    echo "Input is valid."
+fi
+
+exit 0