sometimes it is required to generate a lot of test data

vim /scripts/

# copy given file x times
# usage: copy filename.jpg a 100 times
# ./ filename.jpg 100
for ((i=1; i<=$2; i++)) do cp -v "$1" "$1-$i"; done;

/scripts/ "very-large-image.jpg" 100

# how much test data was generated?
du -hs .
3.7G	.

# generate checksums
sha512sum * > sha512sums

now do something with this test data

and later

to check if all data is still intact, simply run

sha512sum -c sha512sums
very-large-image.jpg-45 ok
very-large-image.jpg-55 ok
very-large-image.jpg-56 ok

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