Find all .bak files in all subfolders and delete them:

find . -name "*.bak" -type f -delete

Move all *.zip files from the /home direcrory and all subdirectories to the /backup directory:

find /home -iname '*.zip' -exec mv '{}' /backup/ \;

Find a file, and 'cat' the contents:

find / -iname *file* -exec cat {} \;

Find the directory MySQL data is stored:

mysql -uUSER -p -e 'SHOW VARIABLES WHERE Variable_Name LIKE "%dir"'

rsync 1 dir to another:

rsync -vaP --remove-source-files ./source/ ./destination

NOTE: be sure to be exact with the trailing '/' (or lack) as shown

rsync "move" that will survive console exit:

nohup bash -c "rsync -vaP --ignore-existing --remove-source-files /source/dir/ /destination/dir ; rm -rf /source/dir" & tail -f nohup.out