Reverse port forwarding

rc.local /usr/lib/autossh/autossh -M 10985 -N -f -o "PubkeyAuthentication=yes" -o "PasswordAuthentication=no" -i /home/djohnson/.ssh/id_rsa -R 20001:localhost:22 djohnson@villageshare.chpc.ac.za & exit 0

How to forward port connections with socat

This will redirect incoming connections to another machine socat TCP-LISTEN:20002,fork TCP:villageshare.chpc.ac.za:80

wget – recursively download all files from certain directory listed by apache Case: recursively download all the files that are in the ‘ddd’ folder for the url ‘http://hostname/aaa/bbb/ccc/ddd/’ Solution: wget -r -np -nH –cut-dirs=3 -R index.html http://hostname/aaa/bbb/ccc/ddd/ Explanation: It will download all files and subfolders in ddd directory: recursively (-r), not going to upper directories, like ccc/… (-np), not saving files to hostname folder (-nH), but to ddd by omitting first 3 folders aaa, bbb, ccc (–cut-dirs=3), excluding index.html files (-R index.html)

Extracting full package list from Ubuntu

ls | awk '{print $1}' | awk -F "_" '{print $1}' > package_list

Adjusting backlight

http://ubuntuforums.org/showthread.php?t=1875126

echo 5 | tee /sys/class/backlight/acpi_video0/brightness

Dropbox on server

http://ubuntuservergui.com/ubuntu-server-guide/install-dropbox-ubuntu-server

wget -O dropbox.tar.gz "http://www.dropbox.com/download/?plat=lnx.x86_64"
wget -O dropbox.tar.gz "http://www.dropbox.com/download/?plat=lnx.x86"
tar -xzvf dropbox.tar.gz
~/.dropbox-dist/dropboxd

sudo vi /etc/init.d/dropbox

#!/bin/sh
# dropbox service
# Replace with linux users you want to run Dropbox clients for
DROPBOX_USERS="user1 user2"

DAEMON=.dropbox-dist/dropbox

start() {
echo "Starting dropbox..."
for dbuser in $DROPBOX_USERS; do
HOMEDIR=`getent passwd $dbuser | cut -d: -f6`
if [ -x $HOMEDIR/$DAEMON ]; then
HOME="$HOMEDIR" start-stop-daemon -b -o -c $dbuser -S -u $dbuser -x $HOMEDIR/$DAEMON
fi
done
}

stop() {
echo "Stopping dropbox..."
for dbuser in $DROPBOX_USERS; do
HOMEDIR=`getent passwd $dbuser | cut -d: -f6`
if [ -x $HOMEDIR/$DAEMON ]; then
start-stop-daemon -o -c $dbuser -K -u $dbuser -x $HOMEDIR/$DAEMON
fi
done
}

status() {
for dbuser in $DROPBOX_USERS; do
dbpid=`pgrep -u $dbuser dropbox`
if [ -z $dbpid ] ; then
echo "dropboxd for USER $dbuser: not running."
else
echo "dropboxd for USER $dbuser: running (pid $dbpid)"
fi
done
}

case "$1" in

start)
start
;;

stop)
stop
;;

restart|reload|force-reload)
stop
start
;;

status)
status
;;

*)
echo "Usage: /etc/init.d/dropbox {start|stop|reload|force-reload|restart|status}"
exit 1

esac

exit 0



sudo chmod +x /etc/init.d/dropbox
sudo update-rc.d dropbox defaults
sudo service dropbox start|stop|reload|force-reload|restart|status

Scanning for ips on subnet with fping

fping -g 128.111.52.0/24 -t 10 2>/dev/null | grep alive | awk '{print $1}'