jump through jump box

We had a network settings. You always have to jump to the jump box and then logon other machine(tmachine). Here is the trick to do the job:
ssh tmachine -o ProxyCommand="netcat-proxy-command jumpbox tmachine"


Copy folder via jump box:
tar cvzf - . |  ssh tmachine -o
ProxyCommand="netcat-proxy-command jumpbox tmachine"
cat ">" folder.tar.gz

The netcat-proxy-command:

#!/bin/sh
#http://www.hackinglinuxexposed.com/articles/20040830.html
bouncehost=$1
target=$2
ssh $bouncehost   nc -w 1 $target 22