gcase

Rename files and folders by case upper, lower, or capitalize

Small utility to fix my recurring pain of capital and uppercase folders. Nothing fancy.

gcase is a CLI tool for bulk-renaming files and directories by changing their case. Point it at a path, pick a mode, and it renames everything with full control over recursion, hidden files, extension preservation, and dry-run previews before touching anything.

Features

Rename files, directories, or both in one shot
Recursive mode for entire directory trees
Dry-run preview to see every change before it happens
Preserve file extensions during rename (e.g. FILE.TXT → file.TXT)
Hidden file support (.dotfiles and .dotdirs)
Deepest paths renamed first safe order guaranteed, no stale parent paths
Works on Linux, macOS, and Windows

Installation

go install github.com/shricodev/gcase@latest

Usage

gcase <command> <path> [flags]

Commands

Command	Description
`lower`	Rename items to lowercase
`upper`	Rename items to uppercase
`capitalize`	Capitalize the first letter of each item name

Flags

Flag	Short	Default	Description
`--dry-run`	`-n`	`false`	Show what would be renamed without changing anything
`--recursive`	`-r`	`false`	Rename recursively
`--target`		`dirs`	What to rename: `dirs`, `files`, or `all`
`--preserve-extension`		`true`	Preserve file extensions when renaming
`--include-hidden`		`false`	Include hidden files and directories

Examples

Preview lowercasing all files recursively, without changing anything:

gcase lower ./myproject --target files --recursive --dry-run

Uppercase all directory names in the current folder:

gcase upper . --target dirs

Capitalize everything recursively, including hidden files:

gcase capitalize ./myproject --target all --recursive --include-hidden

Lowercase file names but keep their extensions untouched:

gcase lower ./myproject --target files --preserve-extension

Rename a single file:

gcase upper ./docs/README.md

Full recursive rename of files and dirs, live (no dry-run):

gcase lower ./myproject --target all --recursive --include-hidden --preserve-extension=false

License

Licensed under the Apache 2.0 License.