Host target.machine
  User          targetuser
  HostName      target.machine
  ProxyCommand  ssh proxyuser@proxy.machine nc %h %p 2> /dev/null

ssh target.machine

ssh -o "ProxyCommand ssh poxyuser@proxy.machine nc -w 1 %h 22" targetuser@target.machine

$ ssh -f -N -L <localport>:<target.machine:port> user@proxy.machine
$ scp target-user@local.machine:/remote/file -P <localport> .

rsync -v --rsh "ssh proxy.machine ssh" target.machine:/remote/file /local/dir/

ssh user@proxy.machine "ssh user@target.machine 'cat > file'" < file

tar cf - file1 file2 folder1/ | ssh user@proxy.machine "ssh user@target.machine 'tar xvf -'"

scp -o "ProxyCommand ssh user@myproxyserver.com nc %h %p" your.filename username@yourdestination.yourdomain.com:/whatever_location

scp -o "ProxyCommand=nc -X connect -x proxyhost:proxyport %h %p" remote_user@remote_host:remote_path local_path