How to combine the output of multiple `find` commands?

Combining:

find -type f \( -name "*.avi" -or -name '*.mp4' \) -exec md5sum {} + > checklist.chk

Adding output to one file:

find -type f -name "*.avi" -exec md5sum {} + > checklist.chk
find -type f -name "*.mp4" -exec md5sum {} + >> checklist.chk

There are many ways to do this:

Using Or -o:

find . -type f \( -name '*.avi' -o -name '*.mp4' \) -exec md5sum {} + > checklist.chk

Using Regex:

find . -type f  -regextype posix-extended -regex '.*\.(avi|mp4)$' -exec md5sum {} + > checklist.chk

Both will write the output to the file checklist.chk.

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