Passwordless permissions (ssh) On Linux 5/6/7 64Bit

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######################## Passwordless permissions (ssh) ########################
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$ chmod 700 Mian Dir like (/u01)
$ cd /u01
$ chmod 700 username like (oracle)
$ cd sysa
$ chmod 700 .ssh
$ cd .ssh
$ chmod 600 authorized_keys
or
$ chmod 640 authorized_keys

########################### Start Linux 7.5 Permissions ###########################
$chmod 700 simbadb                     (On User)
$cd simbadb 
$chmod 700 .ssh                             (On .ssh dir)
$cd .ssh
$chmod 600 authorized_keys (On File)
$chmod 600 id_rsa         (On File)
$chmod 644 id_rsa.pub         (On File)
$chmod 644 known_hosts (On File)
############################ END Linux 7.5 Permissions ##########################
sys@bma ]$ ll -a
drwx------ 5 sys dba 4096 Dec 18 18:15 .
drwx------ 4 sys dba 4096 Dec 18 12:47 ..
-rw------- 1 sys dba 1190 Dec 18 18:37 .bash_history
-rwxrwxr-x 1 sys dba   33 Jun  2  2011 .bash_logout
-rwxrwxr-x 1 sys dba  176 Jun  2  2011 .bash_profile
-rwxrwxr-x 1 sys dba  124 Jun  2  2011 .bashrc
-rwxrwxr-x 1 sys dba  515 Jun 21  2011 .emacs
drwxrwxr-x 3 sys dba 4096 Aug 12  2002 .kde
drwxrwxr-x 4 sys dba 4096 Jun 22  2011 .mozilla
drwx------ 2 sys dba 4096 Dec 18 18:17 .ssh
-rwxrwxr-x 1 sys dba  658 Nov 12  2010 .zshrc
[sys@bma ~]$ cd .ssh
[sys@bma .ssh]$ ll
total 16
-rw------- 1 sys dba  872 Dec 18 18:38 authorized_keys
-rw------- 1 sys dba 1671 Dec 18 18:35 id_rsa
-rw-r--r-- 1 sys dba  407 Dec 18 18:35 id_rsa.pub
-rw-r--r-- 1 sys dba  788 Dec 18 18:17 known_hosts
[sys@bma .ssh]$