Ken Moffat wrote:

 The repeated grep -v invocations sure burn up CPU cycles, but for me
its worth it to remove _most_ of the irrelevant changes.  When I do this
for blfs on a running system there are still occasional irrelevant
changes, e.g. to /etc/ntp.drift, so use with care.

Ken, FWIW my scripts do the following to avoid scanning paths that won't (or shouldn't!) see any changes during a build:

find . -xdev ! -path "./logs/*" ! -path "./home/*" ! -path "./proc/*" \
  ! -path "./sources/*" ! -path "./tmp/*" ! -path "./dev/*" \
  ! -path "./var/log/*" ! -path "./srv/*" \
  -newer timestamp

Regards,

Matt.
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