How to use 'expect' to pass UID & Password to a "for loop" in shell script? Post: 302873695

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Top Forums Shell Programming and Scripting How to use 'expect' to pass UID & Password to a "for loop" in shell script? Post 302873695 by Chubler_XL on Tuesday 12th of November 2013 07:06:15 PM

11-12-2013

Moderator

I haven't found file I/O to be flaky in expect, but I must admit I only really use expect to test solutions posted in the forum. I find it a bit of a hacking tool and would prefer to use passwordless ssh for my own work.

The below script should open the server_list file, connect to each server run the configured command ("multibos -S" in this case) and log the output to a file name config_details with a "hostname:" prefix.

Also note: I'm using telnet in this script and you may want ssh or some other command.

Uncomment the log_user 0 line to suppress output once you have finished debugging.

Code:

#!/usr/bin/expect -f
set timeout 2
set u "souvikm"
set p "passw0rd"
set command "multibos -S"

set hosts [open server_list r]
set config [open config_details w]

#log_user 0

while {[gets $hosts host] >= 0} {
    spawn -noecho telnet $host
    expect "*User_ID*"
    send -- "$u\r"
    expect "?assword*"
    send -- "$p\r"
    send "PS1='PROMPT# '\r"
    expect -re "PROMPT# '(.*)PROMPT# "
    send "$command\r"
    expect -re "\r\n(.*)\r\n(.*)PROMPT# "
    set output $expect_out(1,string)
    puts $config "$host: $output\r"
    send "exit\r"
    expect eof
}
close $hosts
close $config

Last edited by Chubler_XL; 02-25-2017 at 02:26 PM..

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LEARN ABOUT FREEBSD

atf-sh

ATF-SH(1)						    BSD General Commands Manual 						 ATF-SH(1)

NAME

     atf-sh [-s shell] -- interpreter for shell-based test programs

SYNOPSIS

     atf-sh script

DESCRIPTION

     atf-sh is an interpreter that runs the test program given in script after loading the atf-sh(3) library.

     atf-sh is not a real interpreter though: it is just a wrapper around the system-wide shell defined by ATF_SHELL.  atf-sh executes the inter-
     preter, loads the atf-sh(3) library and then runs the script.  You must consider atf-sh to be a POSIX shell by default and thus should not
     use any non-standard extensions.

     The following options are available:

     -s shell	  Specifies the shell to use instead of the value provided by ATF_SHELL.

ENVIRONMENT

     ATF_LIBEXECDIR    Overrides the builtin directory where atf-sh is located.  Should not be overridden other than for testing purposes.
     ATF_PKGDATADIR    Overrides the builtin directory where libatf-sh.subr is located.  Should not be overridden other than for testing purposes.
     ATF_SHELL	       Path to the system shell to be used in the generated scripts.  Scripts must not rely on this variable being set to select a
		       specific interpreter.

EXAMPLES

     Scripts using atf-sh(3) should start with:

	   #! /usr/bin/env atf-sh

     Alternatively, if you want to explicitly choose a shell interpreter, you cannot rely on env(1) to find atf-sh.  Instead, you have to hardcode
     the path to atf-sh in the script and then use the -s option afterwards as a single parameter:

	   #! /path/to/bin/atf-sh -s/bin/bash

ENVIRONMENT

     ATF_SHELL	  Path to the system shell to be used in the generated scripts.

SEE ALSO

     atf-sh(3)

BSD
								September 27, 2014							       BSD

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