Command line options ISQL

I need to find out the command line options for invoking ISQL. I've searched my manuals but can't find them. Possibly because I have different version numbers of the USER guide and REFERENCE manuals. Specifically I need to suppress output messages from the ISQL command line. I can do this with reports, e.g. sacego -s reportname, but how do I do this when running an SQL script? And is there a list somewhere of the command line options. I have the 7.12 Reference. Thanks in advance, Kate