Okay. Thanks for your elaborate explanation. But 
system("sdb -d root on 'sdb -d shell; ls'");

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the syntax used here is what I found to run multiple commands of shell by one system call. But only in this specific case it does not work. 
 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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executing all the 3 shell commands sequentially in one child terminal. and running independently 
system("sdb -d root on");

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also works fine.

In reply to Re^6: Running Multiple Commands using System by dkhoriya
in thread Running Multiple Commands using System by dkhoriya

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