Pairing consecutive frames for later comparison

[hdznrrd]

After converting a video into individual frames, every frame has to be compared with its follower

[hdznrrd]

find frames/ | sort > framelist
len=$(wc -l framelist)

head -n $(echo $len - 1|bc) framelist > first
tail -n $(echo $len - 1|bc) framelist > second
paste first second >pairs
rm first second