Ubuntu: ssh-keygen

Install openssh-client first

sudo apt-get install openssh-client

Suppose

Computer A(192.168.1.111), Computer B(192.168.1.123)

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Login Computer A

ssh-keygen -t [rsa|dsa]

this will generate: id_rsa, id_rsa.pub or id_dsa, id_dsa.pub

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Copy the generated .pub to .ssh directory in Computer B

cat id_dsa.pub >> ~/.ssh/authorized_keys

or

cat id_rsa.pub >> ~/.ssh/authorized_keys

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We can connect to Computer B in Computer A without password

ssh 192.168.1.123

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Examples of ssh commands

ssh remote@192.168.1.120ssh -i ~/.ssh/id_rsa [e-mail] -i ~/.ssh/id_dsa sam@50.17.138.101 -o ServerAliveInterval=60  (Solve Broken pipe problem:-o ServerAliveInterval=60)

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Examples of scp commands

scp -r to-remote remote@192.168.1.120:~/to-remote    (copy directory)sudo scp -i ~/.ssh/id_rsa app.zip [e-mail]:~/app.zip    (copy .zip package)