linux实用命令（1）

To copy, preserving permissions AND structure AND recursively,
from a remote system to your local system:

1	rsync -r -a -v -e ssh server1.address.com:/dir/youwant/to/copy/ /local/location/for/directory/

Please note that the code above assumes that you are using key based authentication and not password.  For password based authentication, it would look more like this:

1	rsync -r -a -v -e ssh remoteuser@server1.address.com:/dir/youwant/to/copy/ /local/location/for/directory/

To remove all files matching a certain extension (xml
in my example) in a directory:

1	find . -type f -name "*.xml" -exec rm -f {} \;

To go into a location, find all files that match a certain
extension (jpg in my example) and move them to a different directory:

1	find . -name "*.jpg" | xargs -i mv '{}' /location/to/move/them/to/

To recursively remove empty directory from the directory
you are currently in (your pwd):

1	find -depth -type d -empty -exec rmdir {} \;