List the contents of the IFS directory

List the contents of the IFS directory without using the C function.

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I had a hurdle in one of my projects to list the contents of an IFS directory -- in the root system. The solutions I found on the Internet were all oriented to using C function, which is interesting, but was not feasible to use as the client had restricted the development language to ILE RPG and CLLE. So through a little bit of typical 'fiddling around', I found this method. (I don't think its a first, but I found it out on my own all the same.) Here's how I did it:

- Listfile has to be created with the CRTPF command without a DDS, the length of the record depends on the maximum possible length of the filename in the IFS dir.

- QSH needs to be installed.

On execution of this command, which is nothing but an output redirection, the file listfile is populated with the filenames of the files in IFS.

 DCL        VAR(&LSCOMMAND) TYPE(*CHAR)
 LEN(200)
 DCL        VAR(&LIBRARY) TYPE(*CHAR) LEN(10) 
 
 CHGVAR     VAR(&LSCOMMAND) VALUE('LS /dir1/dir2/ > +
  
              /QSYS.LIB/' *TCAT &LIBRARY *TCAT +     
       
              '.LIB/listfile.FILE/listfile.MBR')     
         
 QSH        CMD(&LSCOMMAND)         

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  • If you do not have QSHELL installed, then you probably do have FTP installed. Then you still can see what is in the IFS... use FTP to your local box using the reserved loopback IP address 127.0.0.1

    Here's how to do it:

    The FTP command "DIR" will generate a file your RPG programs can read.

    Code: Your CL source should perform a CHGCURLIB &LIB so you know where the file will be put when generated.

    You then OPEN an FTP connection using FTP source. The IP address that you open is FTP RMTSYS('127.0.0.1') and your FTP source should look like:
    user password
    DIR /dir1 (DISK
    CLOSE
    QUIT

    You can then write an RPG program to read the disk file created in your &LIB called DIROUTPUT. This is a more portable solution and the output is great for an RPG subfile, which lets users pick which uploaded file they wish to process. — John Voris

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This was first published in November 2002

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