Script/ways to automate pkgadd which prompts for  y / yes / all

I have hundreds of Solaris 10 VMs which I need to do "pkgrm" & "pkgadd"
& I could issue these commands centrally from a central location instead
of login one by one which makes it much faster for me.

However, the commands won't work if being prompted for inputs
like y or yes or all as shown below.  Is there any option to pkgrm &
pkgadd so that it doesn't prompt for these?

If not, appreciate some sort of scripts (but not Expect TCL script as I'm
not allowed to install these; besides I cant find Expect TCL pkg for
Solaris x86) to facilitate this will be nice:
 
===========================================

# pkgadd -d ./Agent-_5.10_US-9.0.0-9000.x86_64.pkg

The following packages are available:
  1  ms-agent     MicroFocus Agent
                  (x86_64) 9.0.0-9000

Select package(s) you wish to process (or 'all' to process
all packages). (default: all) [?,??,q]: all

Processing package instance <ms-agent> from </var/tmp/Agent-Solaris_5.10_US-9.0.
0-9000.x86_64.pkg>

MicroFocus MSSS Agent(x86_64) 9.0.0-5000
Copyright (c) 2004-2012 MicroFocus Inc.
All rights reserved.
## Executing checkinstall script.
Using </> as the package base directory.
## Processing package information.
## Processing system information.
   8 package pathnames are already properly installed.
## Verifying package dependencies.
## Verifying disk space requirements.
## Checking for conflicts with packages already installed.
## Checking for setuid/setgid programs.

This package contains scripts which will be executed with super-user
permission during the process of installing this package.

Do you want to continue with the installation of <ms-agent> [y,n,?] y

Installing MicroFocus MSSS Agent as <ms-agent>

## Executing preinstall script.
## Installing part 1 of 1.
...

## Executing postinstall script.

Installation of <ms-agent> was successful.