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cd ~/.ssh
ssh-keygen -t rsa -C "email@gmail.com"
ssh-add github_rsa
pbcopy < github_rsa.pub

# -rw-r--r--
chmod 644 github_rsa.pub   

# -rw-------
chmod 600 github_rsa   

# re-add ssh key if passphrase is inaccesible
ssh-add ~/.ssh/github_rsa

# check authenticity to the host
git:(master) ssh -T -o "VerifyHostKeyDNS ask" git@github.com
Hi hamecoded! You've successfully authenticated, but GitHub does not provide shell access.

# ~/.ssh/config
Host heroku.com
 User name
 IdentityFile ~/.ssh/name_dsa

Host github.com
 User name
 IdentityFile ~/.ssh/github_rsa

Host bitbucket.org
 User name
 IdentityFile ~/.ssh/bitbucket_dsa

Host one
    HostName site.co.il
    User superman
  Compression yes

0 - no access to the file whatsoever
1 - execute permissions only
2 - write permissions only
3 - write and execute permissions
4 - read permissions only
5 - read and execute permissions
6 - read and write permissions
7 - read, write and execute permissions (full permissions)

Owner / UserGroupOther/ Everyone