F:\fb2dev\fbbuild\firebird25\temp\Win32\Debug\firebird\bin>isql -x tre.fdb
Database: tre.fdb

SET SQL DIALECT 3;

/* CREATE DATABASE 'tre.fdb' PAGE_SIZE 4096 DEFAULT CHARACTER SET NONE */

[etc]

F:\fb2dev\fbbuild\firebird25\temp\Win32\Debug\firebird\bin>isql -x tre.fdb -user sysdba -pass masterkey
Database: tre.fdb, User: sysdba

SET SQL DIALECT 3;

/* CREATE DATABASE 'tre.fdb' PAGE_SIZE 4096 DEFAULT CHARACTER SET NONE */

[etc]

The database name and user's name are information items that should be deleted before making a script work. Extracting a script should be considered a non-interactive operation (even if sent to the console instead of redirected with -o) and old comments inforce the idea that the user shouldn't be dumped to a script.