added lowercase_file.sh

Author: HariSekhon

bin/lowercase_file.sh

@@ -0,0 +1,48 @@
+#!/usr/bin/env bash
+#  vim:ts=4:sts=4:sw=4:et
+#
+#  Author: Hari Sekhon
+#  Date: 2025-04-26 02:44:42 +0800 (Sat, 26 Apr 2025)
+#
+#  https///github.com/HariSekhon/DevOps-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 steer this or other code I publish
+#
+#  https://www.linkedin.com/in/HariSekhon
+#
+
+set -euo pipefail
+[ -n "${DEBUG:-}" ] && set -x
+srcdir="$(cd "$(dirname "${BASH_SOURCE[0]}")" && pwd)"
+
+# shellcheck disable=SC1090,SC1091
+. "$srcdir/lib/utils.sh"
+
+# shellcheck disable=SC2034,SC2154
+usage_description="
+Renames a file to lowercase, using an intermediate file to work around case insensitive filesystems like on macOS
+"
+
+# used by usage() in lib/utils.sh
+# shellcheck disable=SC2034
+usage_args="<file>"
+
+help_usage "$@"
+
+num_args 1 "$@"
+
+filename="$1"
+
+if ! [ -f "$filename" ]; then
+    die "File not found: $filename"
+fi
+
+filename_lowercase="$(tr '[:upper:]' '[:lower:]' <<< "$filename")"
+
+tmpfile="$filename.lowercase.tmp"
+
+mv -fv "$filename" "$tmpfile"
+
+mv -fv "$tmpfile" "$filename_lowercase"