Copy a large list of sequential files to GCS

copy_filelist_to_gcs.sh

for i in `seq -f '%06g' 1 10`; do echo "/path/to/file.${i}.png"; done | xargs > ./filelist.txt
# ^Generate a space-delimited list of filenames and output it to `filelist.txt`.
# Contents of `filelist.txt`:
# /path/to/file.000001.png /path/to/file.000002.png /path/to/file.000003.png /path/to/file.000004.png /path/to/file.000005.png /path/to/file.000006.png /path/to/file.000007.png /path/to/file.000008.png /path/to/file.000009.png /path/to/file.000010.png

gsutil cp -m `cat ./filelist.txt` gs://png-bucket/path/to/receptacle/
# ^Read the list of files as an argument to gsutil and use multithreaded copy to copy to the bucket.

Maybe can be written as:

gsutil cp -m $(for i in `seq -f '%06g' 1 10`; do echo "/path/to/file.${i}.png"; done | xargs) gs://png-bucket/path/to/receptacle/