This does not seem to be well documented, so here is a quick means of auditing the SQL text that is sent to the server. Note that this simply audits the SQL sent to the server. So, if your user process executes a big stored procedure, all you will see here is a call to the stored procedure. None of the SQL that is executed as part of the stored procedure will be listed.

Firstly, you need to have installed Sybase security (which involves installing the sybsecurity database and loading it using the script $SYBASE/scripts/installsecurity). Read the Sybase Security Administration Manual, you may want to enable a threshold procedure to toggle between a couple of audit tables. Be warned, that the default configuration option "suspend auditing when device full" is set to 1. This means that the server will suspend all normal SQL operations if the audit database becomes full and the sso logs in and gets rid of some data. You might want to consider changing this to 0 unless yours is a particularly sensitive installation.