@, @@, and START Commands

SQL*Plus searches the current default directory for the file name that you specify with the @, @@, or START command. If SQL*Plus cannot find this file, the program searches a path to find the file.

You can specify the path that SQL*Plus searches by modifying the SQLPATH parameter in your registry. For more information about the SQLPATH parameter, see the "SQLPATH Parameter Description" in Appendix A

See the sections "@ (at sign)", "@@ (double at sign)", and "START" in Chapter 8 of SQL*Plus User's Guide and Reference, which describe how SQL*Plus searches for a file when you use the @, @@, or START command.