Recursively find and convert files in place using ImageMagick and Mogrify

convert.sh

# This command would be run from the parent folder that:
# 1. contains the file(s) to be converted
# 2. has subdirectories that contain files to be converted
# 3. both of the above.

# This example finds all .tif files and converts them to .pdf,
# but any conversion supported by ImageMagick could be used here.
# If you don't have ImageMagick installed, you can do so here (https://imagemagick.org/script/download.php)

# for linux
for f in $(find . -name '*.tif');
  do echo "Converting $f";
  mogrify -format pdf "$f";
done;

# for windows
# for /r /d %a in (*) do mogrify -format pdf "%~a\*.tif"