~ $ssh 192.168.1.21 -l pi
The authenticity of host '192.168.1.21 (192.168.1.21)' can't be established.
ECDSA key fingerprint is SHA256:********************************************
Are you sure you want to continue connecting (yes/no)? yes
Warning: Permanently added '192.168.1.21' (ECDSA) to the list of known hosts.
pi@192.168.1.21's password: 

The programs included with the Debian GNU/Linux system are free software;
the exact distribution terms for each program are described in the
individual files in /usr/share/doc/*/copyright.

Debian GNU/Linux comes with ABSOLUTELY NO WARRANTY, to the extent
permitted by applicable law.
Last login: Mon Apr 10 10:09:40 2017

SSH is enabled and the default password for the 'pi' user has not been changed.
This is a security risk - please login as the 'pi' user and type 'passwd' to set a new password.

pi@raspberrypi:~ $ 
pi@raspberrypi:~ $passwd

• タイムゾーンの設定
• パッケージの最新化
• WiFiの有効化

pi@raspberrypi:~ $ sudo raspi-config

Current default time zone: 'Asia/Tokyo'
Local time is now:      Thu Jun 22 21:15:30 JST 2017.
Universal Time is now:  Thu Jun 22 12:15:30 UTC 2017.

pi@raspberrypi:~ $ sudo apt-get update
:
pi@raspberrypi:~ $ sudo apt-get upgrade
:

WiFiを有効にするには、接続するWiFiのSSIDとパスワードが必要です。wpa_passphraseコマンドでキーを取得し、 /etc/wpa_supplicant/wpa_supplicant.confファイルにその結果を書き込んでください。
下記はSSIDがconductor-test、パスワードがconductor-passwordの例です。

pi@raspberrypi:~ $ wpa_passphrase conductor-test conductor-password
network={
	ssid="conductor-test"
	#psk="conductor-password"
	psk=8cf8d6d29427293c0dbe97cb076b306d8d468787d9e3336b3e94de3a45015560
}
pi@raspberrypi:~ $ sudo nano /etc/wpa_supplicant/wpa_supplicant.conf
pi@raspberrypi:~ $ sudo cat /etc/wpa_supplicant/wpa_supplicant.conf
country=JP
ctrl_interface=DIR=/var/run/wpa_supplicant GROUP=netdev
update_config=1
network={
	ssid="conductor-test"
	psk=8cf8d6d29427293c0dbe97cb076b306d8d468787d9e3336b3e94de3a45015560
}
pi@raspberrypi:~ $ 

~ $mkdir raspberryBackup
~ $cd raspberryBackup/
raspberryBackup $df
Filesystem                                                      512-blocks       Used  Available Capacity   iused      ifree %iused  Mounted on
/dev/disk1                                                       487653376  257179480  229961896    53%   1502547 4293464732    0%   /
devfs                                                                  369        369          0   100%       640          0  100%   /dev
:
disk2s1                                                              82644      42779      39865    52%         0          0  100%   /Volumes/boot
raspberryBackup $diskutil unmountDisk /dev/disk2
Unmount of all volumes on disk2 was successful
raspberryBackup $sudo dd if=/dev/disk2 of=./rasberry3.dmg
Password:
30564352+0 records in
30564352+0 records out
15648948224 bytes transferred in 1743.520160 secs (8975490 bytes/sec)
raspberryBackup $ls -la
total 30564368
drwxr-xr-x   4 ****  staff          136  6 22 23:43 .
drwxr-xr-x+ 52 ****  staff         1768  6 22 23:34 ..
-rw-r--r--@  1 ****  staff         6148  6 22 23:43 .DS_Store
-rw-r--r--   1 root  staff  15648948224  6 23 00:12 rasberry3.dmg
raspberryBackup $ls -l
total 30564352
-rw-r--r--  1 root  staff  15648948224  6 23 00:12 rasberry3.dmg
raspberryBackup $

raspberryBackup $df
Filesystem                                                      512-blocks       Used  Available Capacity   iused      ifree %iused  Mounted on
/dev/disk1                                                       487653376  257179480  229961896    53%   1502547 4293464732    0%   /
devfs                                                                  369        369          0   100%       640          0  100%   /dev
:
disk2s1                                                              82644      42779      39865    52%         0          0  100%   /Volumes/boot
raspberryBackup $diskutil unmountDisk /dev/disk2
Unmount of all volumes on disk2 was successful
raspberryBackup $sudo dd if=./rasberry3.dmg of=/dev/rdisk2 bs=1m