D:\>isql -q
SQL> help;
Frontend commands:
BLOBDUMP <blobid> <file>   -- dump BLOB to a file
BLOBVIEW <blobid>          -- view BLOB in text editor
EDIT     [<filename>]      -- edit SQL script file and execute
EDIT                       -- edit current command buffer and execute
HELP                       -- display this menu
INput    <filename>        -- take input from the named SQL file
OUTput   [<filename>]      -- write output to named file
OUTput                     -- return output to stdout
SET      <option>          -- (Use HELP SET for complete list)
 SHELL    <command>         -- execute Operating System command in sub-shell 
SHOW     <object> [<name>] -- display system information
    <object> = CHECK, COLLATION, DATABASE, DOMAIN, EXCEPTION, FILTER, FUNCTION,
               GENERATOR, GRANT, INDEX, PROCEDURE, ROLE, SQL DIALECT, SYSTEM,
               TABLE, TRIGGER, VERSION, USERS, VIEW
EXIT                       -- exit and commit changes
QUIT                       -- exit and roll back changes

All commands may be abbreviated to letters in CAPitals

. . .
execute procedure p1;
shell dir c:\*.*;
execute procedure p2;
. . .