---
title: Renaming in Rails Projects with `sed` and `find`: A Guide
slug: renaming-in-rails-projects-with-sed-and-find-a-guide
published_at: 2023-09-20 20:25:00 +0000
updated_at: 2024-07-27 21:59:29 +0000
summary: In this Article, you will learn how to efficiently rename references in Rails projects using `sed` and `find`. Master these tools to streamline your refactoring process! 🚀
tags: [Bash]
author: CJ Avilla
url: https://www.cjav.dev/articles/renaming-in-rails-projects-with-sed-and-find-a-guide
type: article
---

# Renaming in Rails Projects with `sed` and `find`: A Guide

*Published: September 20, 2023*
*Tags: Bash*

![image.png](/rails/active_storage/blobs/eyJfcmFpbHMiOnsiZGF0YSI6MTgsInB1ciI6ImJsb2JfaWQifX0=--9fe2c7c84b98a5a17c6107a2df19a1a914289dc8/image.png)

## Refactoring File Contents

When renaming references in numerous files, sed is a handy tool. For instance, to replace all instances of gutter_area with gutter_system:

```bash
sed -i 's/gutter_area/gutter_system/g' *
```

However, macOS users might encounter the "invalid command code" error due to the -i option. On macOS, sed expects an extension for backup:

```bash
sed -i '' 's/gutter_area/gutter_system/g' *
```

Or, with backups:

```bash
sed -i '.bak' 's/gutter_area/gutter_system/g' *
```

Remember, if you create backup files and no longer need them:

```bash
rm *.bak
```

Targeting Only Regular Files

The sed command can attempt to modify directories, leading to errors. To ensure only files are targeted, combine find with sed:

```bash
find . -type f -exec sed -i '' 's/gutter_area/gutter_system/g' {} +
```

To limit changes to the current directory only:

```bash
find . -maxdepth 1 -type f -exec sed -i '' 's/gutter_area/gutter_system/g' {} +
```

### Understanding the `{} +`

In the find command, `{} +` is an efficient way to batch-process files. The `{}` placeholder represents the current file, while `+` groups filenames, reducing the number of command invocations.

**Addressing Character Encoding Issues**

Errors related to "illegal byte sequence" are often due to character encoding issues. Set the LC_ALL or LANG environment variable to a UTF-8 locale:

```bash
LC_ALL=en_US.UTF-8 find . -type f -exec sed -i '' 's/gutter_area/gutter_system/g' {} +
```

I thought the character encoding issues might actually be related to trying to replace inside a png or tiff file so I wanted to target specific file types.

To target only certain file types, use the `-name` option:

```bash
find . \( -name '*.rb' -o -name '*.html.erb' -o -name '*.tsx' -o -name '*.jbuilder' -o -name '*.yml' \) -type f -exec sed -i '' 's/gutter_area/gutter_system/g' {} +
```

## Renaming Files and Directories

To rename files and directories containing a specific string:

For directories:

```bash
find . -type d -name '*gutter_area*' -exec sh -c 'mv "$0" "${0/gutter_area/gutter_system}"' {} \;
```

For files:

```bash
find . -type f -name '*gutter_area*' -exec sh -c 'mv "$0" "${0/gutter_area/gutter_system}"' {} \;
```

Once I had a few commands dialed in and working, I used them to also replace `GutterArea` with `GutterSystem` and `Gutter Area` with `Gutter System` and so on.

## Recommendations and Warnings:

* Always back up your data before mass-renaming operations.
* Test commands on a small subset of data to ensure desired results.
* Character encoding can vary. Ensure you understand your project's encoding before making changes.
* When refactoring, ensure other aspects like database column names or external references are also updated if necessary.

Refactoring can be daunting, but it becomes a manageable task with the right tools and understanding. By mastering commands like `sed` and `find`, you'll efficiently handle large-scale project renaming.


---

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