#!/usr/local/bin/perl
use strict;
use warnings;
             
    system("sdb -d root on 'sdb -d shell; cd /opt; ls';bash ");
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gives error of "root does not take more than one arguement" while the following system call runs fine.

    system("sdb -d shell 'cd /opt; ls';bash ");
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and running independently

   system("sdb -d root on");
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also works fine.