How can I change the root password on all 10 of my servers? 1

[farley99]

How can I change the root password on all 10 of my servers?

 

[marsd]

Assuming that you want to do it remotely and with
some degree of error control you could use expect
to drive ssh sessions with a set of commands to be
executed once logged in.

If you want an example of something like this
I'll provide one.

 

[farley99]

Please provide the example.

 

[marsd]

#!/usr/bin/tclsh
package require Expect

####functions#########
proc getIn {msg} {
stty -echo
       puts -nonewline "INPUT:$msg "
       flush stdout
       set ans [gets stdin]
       stty echo
       return ans
}

#exp_internal 1
set timeout 125
#first and second args are remote hostname and username.
set username [lindex $argv 0]
set prompt ".*@.*"
set rootprompt "root@.*"
####main()###########

   foreach poss [lrange $argv 1 [llength $argv]] {
                spawn -noecho deslogin $username@$poss
                lappend ids $spawn_id
               

                expect {
       
                           -re ".*ass.*hras.*" {
                            send "[getIn \"Enter password for $poss\"]\r"
                            expect -re $prompt {
                                               send "TERM=vt100\r"
                                               send "su root\r"
                                               expect -re ".*assw.*" {
                                                          send "[getIn \"Root password please\"]\r"
                                                          expect -re "$rootprompt" {
                                                                     send "passwd\r"
                                                                     expect -re ".*ew.*assw.*" {
                                                                                set new [getIn "\New password\"]
                                                                                send "$new\r"
                                                                                expect -re ".*enter.*assw.*" {
                                                                                            send "$new\r"
                                                                                            expect -re "$rootprompt" {interact -i $spawn_id}
                                                                                 }                    
                                                                      }                                    
                                                           }                                                                                                              
                                                   }
                             }
                         }
                  }

    }

#remainder of script allows the user to interact with the spawnede sessions, switch back and forth, issues a keepalive, etc..