A simpler solution than using SET rs=##CLASS(%ResultSet).%New("%File:FileSet"), is the $ZSEARCH() function:

    SET f=$ZSEARCH(SDIR)
    WHILE f'="" {
        // Do something with f
        SET f=$ZSEARCH(f)
    }

There is no need to create a child process or use classes.

Although the interface is clunky for looking through large journal files, the startup cost is negligible:

%SYS>DO ^JRNDUMP

Select "G" for Goto

File: enter your filename which doesn't have to be and shouldn't be in the main journal directory.

At this point the interface is limited, but "F" for Find might help.

If you are trying to run arbitrary code from a Windows .BAT file, the following almost works:

ECHO ZN "%%SYS" DO ^^^^SECURITY HALT | C:\InterSystems\Cache\bin\cache.exe -s C:\InterSystems\Cache\mgr

The limitations are:

• You have to specify the locations of the Caché or IRIS executable and the \mgr directory with an -s option.
• One cannot redirect command input from the terminal, so what you run can't be interactive.
• Quoting for Windows may annoy you.