ssh

                             

Linux Administrators  normally login to the linux servers either 
supplying a password, or using keybased authentication. sshpass 
command is a tool which allows us to automatically supply 
password to the command prompt so that automated scripts can 
be run as desired by users.




Features of sshpass :

 1.Taking backups to a remote server
 2.Executing commands on systems at a specified time.

Step1:
Setup the RPMforge  (or)  EPEL repository

Then run root 

   #yum install sshpass -y

Getting Help :

  #sshpass -h

Usage: sshpass [-f|-d|-p|-e] [-hV] command parameters
   -f filename      Take password to use from file
   -d number       Use number as file descriptor for getting password
   -p password    Provide password as argument (security unwise)
   -e                    Password is passed as env-var "SSHPASS"
  
 With no parameters - password will be taken from stdin

   -h                 Show help (this screen)
   -V                Print version information
At most one of -f, -d, -p or -e should be used

How to use sshpass command:
Login to ssh server called server.example.com with password called trDR34@r%$#:

$ sshpass -p 'trDR34@r%$#' ssh username@server.example.com

How to backup data using sshpass:

$ sshpass -p 'password' scp  -r  username@server.example.com:/var/www/*   /backupdata

(where backup data from remote server to local server)