# rename /

Filename Size Date modified Message
bin
src
141 B
32.1 KB
42 B
6.1 KB
1.9 KB

# rename

Renames files using regular expression matching. This enables elegant handling of multiple renames using a single command.

## Usage

Basic syntax:

rename [-i] [-l] [-t] [-u] [-v "except_regex"] "regex" "target"


## Options

### regex

Regular expression that matches source files which are to be renamed. Examples:

"(\w+).caf"
"IMG(\d\d\d\d\).[Jj][Pp][Ee]?[Gg]"
"([0-9]{2})-([0-9]{2})-([12][0-9]{3}).log"


## Installation

This script requires Python 2.4+ with the argparse library. It can be used standalone or installed using pip or easy_install:

pip install rename
easy_install rename


Don't have either of these? You can always grab the latest source release from the PyPI website or better yet equip yourself with easy_install by downloading and running distribute_setup.py.

## Security

1. The script will not let multiple files be renamed to a single name.
2. The script will not let existing files to be overwritten.
3. Both checks above are made for all matches before any renaming is performed.

## Other remarks

1. Regular expressions supported by the script must conform to the syntax handled by Python's re module.
2. Actual renaming of a single file is done by the os.rename() function from Python's standard library. No additional atomicity is ensured, e.g. if a single rename fails halfway through, the filesystem is left in a state of partially complete renaming.
3. Due to differences in behaviour of different shells, the recommended form of execution is to put both arguments in quotation marks.

## Possible future enhancements

1. Automatic numbering with \(auto) target reference.

2. -s option to enable a "translate" mode to replace certain substrings with others. Proposed syntax:

rename -s "substring_from" "substring_to" "file_match_regex"


Example (translating underscores to spaces):

rename -s "_" " " ".*\.txt"


This would be more-less compatible with behaviour of the existing rename tool from the util-linux-ng package. One obvious difference would be that the file mask doesn't use wildcards but regular expressions.

3. -p option to create intermediate directories for the target. One tiny problem is maintaining atomicity of the whole transaction.

4. -r option to make the source match recursive. Tricky to get right I guess, e.g. where to rename? Existing directory structure or new one?. Let the user decide? What's the default? Etc. etc.

## BFD: BIG FRIENDLY DISCLAIMER

This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, version 3 of the License.

This program is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details.

DON'T PANIC. This code has been successfully used by its author and contains tests. However, be especially wary under these conditions:

1. Renaming between filesystems.
2. Renaming under case-insensitive filesystems.
3. Renaming within very long paths.
4. Renaming volatile state (e.g. rotating logs).

And if you do lose any data, it's your fault. Have a nice day!

## Authors

Script glued together by Łukasz Langa.