Write ISO to USB stick

Its actualy pretty easy to do this in the terminal:

Code:

$ diskutil list

and it returns something like
Code:

/dev/disk0
#:                       TYPE NAME                    SIZE       IDENTIFIER
0:      GUID_partition_scheme                        *1.0 TB     disk0
1:                        EFI                         209.7 MB   disk0s1
2:                  Apple_HFS Macintosh HD            999.9 GB   disk0s2
/dev/disk1
#:                       TYPE NAME                    SIZE       IDENTIFIER
0:     FDisk_partition_scheme                        *4.1 GB     disk1
1:                 DOS_FAT_32 GENTOO LIVE             4.1 GB     disk1s1

Now unmount the disk using diskutil replace the disk number with the id of your usb stick

Code:

$ diskutil unmountDisk /dev/disk1

And use DD to write again replace the disk number
Code:

dd if={ISO_IMAGE_HERE_} of=/dev/disk1 bs=1m

Replace if={} with the path to your iso image

Disabling startup of a service in Ubuntu

Sometimes is not easy to solve easy problems.
Today, after some research, I found how disable service in Ubuntu… It’s better to fix that, instead to lose more time in a near future.
To disable a service in Ubuntu it’s necessary remove the symlinks from all the runlevel-specific directories, /etc/rc*.d. The command to do that is update-rc.d.
Esample:
ubuntu# update-rc.d -f openvpn remove

reference