get e.g. all .jpgs in a dir and subdirs, copy or delete them

copy_files_recursive.sh

#  sed 's\.*/\\'  cuts anything before the final forward slash , leaving filename without path 
for f in $(find . -name '*.jpg'); do echo $f;echo $f|sed 's\.*/\\' ;cp $f $(echo $f|sed 's|.*/||'); done

#or e.g. only .jpgs larger than 10k and put in specific dir
for f in $(find /path/to/dirwithsubdirs/ -name '*mark.png' -size +10k ); do echo $f;echo $f|sed 's|.*/||' ;cp $f /path/to/destiny/data_logos/$(echo $f|sed 's\.*/\\'); done

#dont clobber extant files, by using cp --backup=numbered
for f in $(find /path/to/dir -name '*.jpg'); do cp --backup=numbered $f pics/$(echo $f|sed 's|.*/||'); done