REN.sh

Renames bad file extensions, Converts images, Creates PDFs, Compresses folders

A companion script for KDE connect.

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Purpose

• I transfer a lot of files between my devices.

• When I transfer files from my phone to my computer, some files do not have proper extensions.

• Just running REN [/path/to/directory] (If no path is specified, it runs in the present working directory) will fix all files with wrong extensions in that directory.

• Currently, this script can properly rename the following file/mime types:

          File type                  ->    Extension
          
    	1. WEBP (image/webp)         ->    .webp
    	2. PNG (image/png)           ->    .png
    	3. JPEG (image/jpeg)         ->    .jpg
    	4. HEIC (image/heic)         ->    .heic
    	5. MP4 (video/mp4)           ->    .mp4
    	6. MKV (video/x-matroska)    ->    .mkv
    	7. MOV (video/quicktime)     ->    .mov
    	8. MP3 (audio/mpeg)          ->    .mp3
    	9. DOCX (* WORD DOCUMENT)    ->    .docx
    	10. PDF (application/pdf)    ->    .pdf
    	
    * mime type of word documents: application/vnd.openxmlformats-officedocument.wordprocessingml.document
  

• Support for more formats is underway. But these are the most commonly used file types.

• A file named foo.bar.ext.png which is of file type image/jpeg will be renamed to foo.bar.ext.jpg.

• Originally, this script just renamed files to their proper extensions. But a few more functionalities were added.

• Additional functionalities include:

  • I added colors!!

  • If the name of the current folder is foo, REN -x converts all 'png' and 'webp' files into 'jpg' files (Using ImageMagick - convert), and places all files in the current directory in a new folder in current directory with the name foo.zipper (other files will be copied as they are).

  • REN -xpdf will create a PDF file from all the images in the folder foo.zipper and promptly removes the folder foo.zipper

  • REN -xzip will create a PASSWORD-PROTECTED ZIP file (Using zip -re) from the folder foo.zipper (in the parent directory alongside the current directory - foo), and promptly removes the folder foo.zipper.

  • Both -xpdf and -xzip are extensions of REN -x. Currently, all three options - -x, -xpdf, -xzip only run in the current directory - path to a directory cannot be specified with these three options.

    I regularly use REN -xzip to transfer archives to my iPad and REN -xpdf to transfer images to Android devices.

  • REN -l [/path/to/folder] (works on current directory if no path is specified) will list all files in the specified path and their corresponding file/mime types. Useful for analysis & debugging.

  • REN -h or REN --help will display help info and exit.

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How to use it?

Install:

• There is a make file in this directory. Use the following command to install this app.

$ sudo make install

Dependencies:

• file
• zip
• convert (ImageMagick)

The Makefile will check if all dependencies are satisfied.

Uninstall:

• Again, use the same make file to uninstall (Recommended):

$ sudo make remove

• Alternatively, run this command (Not Recommended):

$ sudo rm /usr/bin/REN

Display Help:

• Just use REN -h or REN --help to see help info.

Rename files to their proper extensions:

• REN [/path/to/directory] will rename all files to their proper extensions.
• For example, if $file is set to example.jpg.txt, and it is a PNG file, then ${file##.} will remove the longest match of *. from the beginning of the string. The file will be renamed to example.jpg.png. If you want, you can change this to ${file#.} - to rename example.jpg.txt as example.png (line 115, 116 in REN.sh)

List mime types of all files in a directory:

• REN -l [/path/to/directory] will list all files and their corresponding mime types.

• Under the hood, it uses the following command to determine the file/mime type:

  $ file -b --mime-type "$file"

Convert PNG and WEBP files to JPGs:

• REN -x creates a folder ${PWD}.zipper (where $PWD is present working directory) alongside the current directory.

Convert a folder full of images (PNG, WEBP and JPG) into PDF:

• REN -xpdf will create a folder named 'PDF' alongside the current working directory.

Convert a folder into a Password-protected zip file:

• Ren -xzip will create a zip file alongside the current working directory. You will be prompted to enter (and verify) your password in the terminal.

Copyright Notices:

• Use REN -c to view copyright notice.

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Licensing

• I don't care what you do with this.
• But it would be kewl if you mention me.
• Check the LICENSE file.

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Contribution

• Do let me know if there is some edge case(s).
• Any forks and merge requests are accepted.

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Authored by: @_devlinman

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P.S.

Tip to find mime types easily:

alias mime="file -b --mime-type"

Use JetBrains Mono!

=> ~~>