Extract Files from Subfolders

extract.sh

#!/usr/bin/env bash

# This script extracts all files with the given name from directories within the current one 
# into the given directory, while attaching identifiers to the extracted files. 
#
# A file 'Testfile.txt' will be extracted from some folder 'Name_Number_Something/subfolder/asubfolder/' to 
# the folder 'out' by executing
# 
# ./extract Testfile.txt out
#
# Arguments: 
# 
# $1 - The file to extract
# $2 - The folder to extract to. Will be created if it doesn't exist
#
main() {
  local filename=$1
  local destination=$2

  for file in **/"$filename"; do
    name=$(echo "${file}" | cut -d'_' -f 1)
    number=$(echo "${file}" | cut -d'_' -f 2)
    cp -v "${file}" "$destination/${name}_${number}_$filename"
  done
}

shopt -s globstar

main "$@"