rename-ext

changes file-extension based on mime-type

also

• removes *?|^:"<> characters from the file-name
• reducing multiple spaces, dots, and underscores
• adds rename-date suffix to ensure uniquness of the filename
• strips exec-flag from non-executive types (usual leftover from FAT/NTFS)
• optimizes images while at it (shows reduction size in kb and %)

install

1. look at install file for instructions
2. adjust PREFIX at wish
3. make sure the final directory is on $PATH

use

rename-ext /Data/Pictures/_unsorted/**/*

to only change extension and nothing else:

rename-ext --only-ext /Data/Photos/2020/*

to only print a report:

rename-ext --test-run /Data/Docs/_dump/*

requires

• file - to determine file type
• sd – better sed
• jpegoptim – to compress JPEGs
• imagemagick or graphicsmagic – to mogrify PNGs
• pngcrush – to compress PNGs

todo

• find better determination tool for application/octet-stream
• leverage fd to do recursive paralel execution if some of parameters are folders

q&a

Q: why not just rename files to hashes of their contents, and store original filenames in some database?

A: good point. that database is in my case a filesystem itself.