Find files in current catalog with text «sometext»:find -type f -exec grep -q sometext {} \; -print
Find all files in all subdirectories and execute script/command:find . -type d -print0 | xargs -0 -L1 sh -c 'cd "$0" && pwd && ./script.sh unpack'
Find all files in the current folder that are less than 1 kilobyte and delete them:find . -type 'f' -size -1k -delete