To perform silent installation you need setup.iss file. If you doesn’t have this file use graphical installer to create one.
Now run the installer using /r switch (record) and go through all the installation dialogs to complete installation. This will create a setup.iss file.
Now place this file in C:\Windows directory because this will store all your responses to the dialogs. Now copy the setup.iss file to the same directory as the installer executable.
Now run installer using /s switch (silent). This will perform an unattended installation.

Installer will return immediately even if you run it under start /wait. This is not useful for scripting purposes. Luckily, there is another switch /sms, which will cause the installer to pause until the installation completes.
For an InstallShield application you should provide both the /s and the /sms switches.

The /f1filename switch allows you to specify a fully-qualified alternate name for the setup.iss file.
Note that there must be no space between the /f1 switch and the file name.
This switch works both with /r to create the file and with /s to read it.
The /f2filename switch specifies a log file. Once again, there must be no space between the switch and the file name.
Characters you use in these file names should not have non-alphanumerics (like hyphens) because installshield silently removes them.
Many packages have “custom dialogs” which are not supported by setup.iss, which means the dialogs will always appear no matte

Installshield is a software for creating setups/ installers. InstallShield was the name of the company when it was originally created. Installshield was founded by Viresh Bhatia, an Indian American graduate from Northwestern University, and Rick Harold.  It was acquired by Macrovision in 2004. Macrovision is currently adding the FLEXnet name to the well-known InstallShield brand in its products and web site.

The two primary types of installer that can be created by the Windows version of the InstallShield tool are called Basic MSI and InstallScript. Basic MSI projects are built into  Basic MSI packages, and InstallScript projects are created using an event-based script and built into setup.exe executables. (A third type of project, called InstallScript MSI, exists, using the InstallScript programming language for the user interface and customization of the installer, and the Windows Installer engine for the data-transfer part of the installer.)

There is now a version of the InstallShield Wizard forLinux. Sun Microsystems uses it for its Linux installations.