ITEM: BC3130L

Problems with uppercase vs lowercase filenames on DOS CDROM

Env: Model 250 running AIX 3.2.5

Desc: Customer is making a CDROM on a PC that is being used on a 
Model 250.  The customer application requires that the filenames be 
in uppercase. They show up as uppercase on the PC, but they show up 
as lowercase on AIX.  He wants to know how to make these files 
appear in uppercase to AIX so that their software will work properly.

Action: Filenames in DOS are always uppercase because MS/DOS is NOT
case sensitive and converts everything to UPPERCASE. AIX IS case 
sensitive and tends to do everything in lowercase.

At AIX 3.2, you have to use ISO 9660 format CDROM's. ISO 9660 
requires that the filenames be in uppercase; however, AIX converts 
the filenames to lower case before displaying the filenames.  The
good news is that even though the filenames for the files on this 
CDROM are shown in lowercase when you list the contents, you CAN 
still specify the filename in UPPERCASE and it will still use the 
correct file.

Example:

A file is called /cdrom/bob

"cat /cdrom/bob" and "cat /cdrom/BOB" will both work.

If you have RockRidge Extensions, then the file names can be case
sensitive and thus they can show as uppercase, but this format is only
supported in AIX 4.1 and not AIX 3.2.



Support Line: Problems with uppercase vs lowercase filenames on DOS CDROM ITEM: BC3130L

Dated: December 1995 Category: N/A

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