feat(sendsms): add script to randomize CSV data

cmd/sendsms/randomize.sh

@@ -0,0 +1,39 @@
+#!/bin/sh
+set -e
+set -u
+
+g_csv="${1:-}"
+
+fn_help() {
+   echo "USAGE"
+   echo "   # sort -R ./list.csv > ./list.csv.bak"
+   echo "   ./randomize.sh ./list.csv"
+}
+
+fn_tip() {
+   echo "IMPORTANT"
+   echo "    Now go move the header back to the first row"
+}
+
+main() {
+   if test -z "${g_csv}" || ! test -s "${g_csv}"; then
+      >&2 fn_help
+      return 1
+   fi
+
+   if test -s "${g_csv}.randomized"; then
+      {
+         echo "${g_csv}.randomized already exists"
+         fn_tip
+      } >&2
+      return 1
+   fi
+
+   sort -R "${g_csv}" > "${g_csv}.randomized"
+   {
+      echo "wrote ${g_csv}.randomized"
+      fn_tip
+   } >&2
+}
+
+main