# find Syncthing conflicts find ~ -name "*.sync-conflict-*" # delete files with modification date older than specified date find . \! -newermt "2020-01-01" -delete
find . \! -name "something" # or: find . -not -name "something"
fdfind is an alternative to the default find tool. It's faster and more user friendly.
Package name: fd-find (Fedora)