Diff 2 sets and apply command to deltas
If you have golang, easiest install is
go install github.com/fortio/delta@latestOr brew custom tap
brew install fortio/tap/delta
Otherwise head over to https://github.com/fortio/delta/releases for binary releases
delta -b "echo NEW:" -a "echo REMOVED:" oldFile newFile
if oldFile is
old1
old2
gone1
old3
and newFile is
new1
old1
old2
old3
new2
will output
REMOVED: gone1
NEW: new1
NEW: new2
See also delta.txtar for examples (tests)