Installer:Command Line Arguments

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<path to setup executable> [/S] | [/D=<full path to installation directory>]
<path to setup executable> [/INI=<full path to configuration ini file>]
<path to setup executable> [-ms] (deprecated)

Silent installation:
/S or -ms
-ms is deprecated

note: /S is currently broken - bug 506867

Installation directory:
/D=<full path to install directory>

Configuration ini file:
When specifying a configuration ini file the installer will always run silently. When specifying a Configuration ini file other command line switches should not be specified and may have unexpected results
/INI=<full path to configuration ini file>

Configuration ini file syntax:

[Install]
; The name of the directory where the application will be installed in the
; system's program files directory. The security
; context the installer is running in must have write access to the
; installation directory. Also, the directory must not exist or if it exists
; it must be a directory and not a file. If any of these conditions are not met
; the installer will abort the installation with an error level of 2. If this
; value is specified then InstallDirectoryPath will be ignored.
; InstallDirectoryName=Mozilla Firefox

; The full path to the directory to install the application. The security
; context the installer is running in must have write access to the
; installation directory. Also, the directory must not exist or if it exists
; it must be a directory and not a file. If any of these conditions are not met
; the installer will abort the installation with an error level of 2.
; InstallDirectoryPath=c:\firefox\

; By default all of the following shortcuts are created. To prevent the
; creation of a shortcut specify false for the shortcut you don't want created.
;
; Create a shortcut for the application in the current user's QuickLaunch
; directory.
; QuickLaunchShortcut=false
;
; Create a shortcut for the application on the desktop. This will create the
; shortcut in the All Users Desktop directory and if that fails this will
; attempt to create the shortcuts in the current user's Start Menu directory.
; DesktopShortcut=false
;
; Create shortcuts for the application in the Start Menu. This will create the
; shortcuts in the All Users Start Menu directory and if that fails this will
; attempt to create the shortcuts in the current user's Start Menu directory.
; StartMenuShortcuts=false

; The directory name to use for the StartMenu folder.
; note: if StartMenuShortcuts=false is specified then this will be ignored.
; StartMenuDirectoryName=Mozilla Firefox