Rename multiple files of different name and extensions with parent directory name

Question

I'm trying to figure out how to rename multiple files (100s) that have different extensions to their respective sub directory name. Here is the structure:

Parentdir
  |--subdir1 
    |---name1.txt
    |---name2.jpeg
    |--name3.ovc
  |--subdir2
    |--name4.txt
    |--name5.tiff
    |-name6.mpeg

what I would like to do is batch process a rename of all files within their respective subdir name while maintaining their extension.

From the parent directory I was using this command but I'm having issues with the file extensions:

for subdir in *; do mv $subdir/*  $subdir.mpeg; done;

Answer 1

I conjured this script that can help to achieve what you want:

#!/usr/bin/env bash
set -e

for i in "$1"/*/*
do
    old="${i##*/}"
    ext="${i##*.}"
    name=$(basename "${i%/*}")
    [ ! -d "$i" ] && [ ! -f "$1/$name/$name.$ext" ] && mv "$1/$name/$old" "$1/$name/$name.$ext"

done

Test:

parentdir
├── subdir1
│   ├── name1.ovc
│   └── name1.txt
└── subdir2
    ├── name2.ovc
    └── name2.txt

Results:

parentdir
├── subdir1
│   ├── subdir1.ovc
│   └── subdir1.txt
└── subdir2
    ├── subdir2.ovc
    └── subdir2.txt

Usage: ./script.sh Parentdir

Information:

• old="${i##*/}": returns filename to change (name1.ovc)
• ext="${i##*.}": returns file extension (mpeg, txt)
• name=$(basename "${i%/*}"): returns immediate parent directory of target file (subdir1)
• [ ! -d "$i" ]: check if not a directory
• [ ! -f "$1/$name/$name.$ext" ]: Check if the file already exists and has been renamed already