Flush the L3 switch ARP cache

/sbin/arping -f -q -c 5 -w 5 -I $IFACE -s $IP -U $SWITCH_IP

Copying files over to a different machine in a fast way:

Destination box: nc -l 2342 | lzop -d | tar -C /target/dir -xf -
Source box: tar -c /source/dir | lzop | nc Target_Box 2342

SSH-Agent and KDE4.1

cd
mkdir -p .kde4/env .kde4/shutdown
echo 'eval `ssh-agent`' > .kde4/env/ssh-agent.sh
echo 'ssh-agent -k' > .kde4/shutdown/ssh-agent.sh
chmod +x .kde4/env/ssh-agent.sh .kde4/shutdown/ssh-agent.sh