diff --git a/csv_header_indices.sh b/csv_header_indices.sh
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+#!/usr/bin/env bash
+# shellcheck disable=SC1090
+#  vim:ts=4:sts=4:sw=4:et
+#
+#  Author: Hari Sekhon
+#  Date: 2020-01-13 10:54:20 +0000 (Mon, 13 Jan 2020)
+#
+#  https://github.com/harisekhon/bash-tools
+#
+#  License: see accompanying Hari Sekhon LICENSE file
+#
+#  If you're using my code you're welcome to connect with me on LinkedIn and optionally send me feedback to help improve or steer this or other code I publish
+#
+#  https://www.linkedin.com/in/harisekhon
+#
+
+# Quick script to convert CSV header to column numbers for quicker programming reference
+# and reducing human counting errors for large CSVs such as from AWS credential reports
+#
+# eg.
+#
+# ./csv_header_indices.sh <<< "user,arn,user_creation_time,password_enabled,password_last_used,password_last_changed,password_next_rotation,mfa_active,access_key_1_active,access_key_1_last_rotated,access_key_1_last_used_date,access_key_1_last_used_region,access_key_1_last_used_service,access_key_2_active,access_key_2_last_rotated,access_key_2_last_used_date,access_key_2_last_used_region,access_key_2_last_used_service,cert_1_active,cert_1_last_rotated,cert_2_active,cert_2_last_rotated"
+
+set -euo pipefail
+[ -n "${DEBUG:-}" ] && set -x
+
+head -n 1 "$@" |
+tr ',' '\n' |
+nl -v 0  # -v 0 starts indexing at zero as this is what you need when coding