Different installers use different command-line options for silent or unattended installs. Since I had started these notes, I have found a good overview on unattended.sourceforge.net.
Inno Setupcan be identified with the "Inno Setup" string appearing in various places in the installer's .exe. The options are described here. The most useful ones are:
Save installation settings to the specified file.
Load the settings from the specified file after having checked the command line.
Disables the This will install... Do you wish to continue? prompt at the beginning of Setup.
- /SILENT, /VERYSILENT
When Setup is silent the wizard and the background window are not displayed but the installation progress window is. When a setup is very silent this installation progress window is not displayed. Everything else is normal so for example error messages during installation are displayed.
Specifies the language to use. language specifies the internal name of the language as specified in a [Languages] section entry.
Nullsoft's NSIScan be identified with the "NSIS" string appearing in various places in the installer's .exe. The options are described here, but there seem to be only 2 useful ones:
Set output folder