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Top Forums UNIX for Dummies Questions & Answers Unix History Question: Why are filenames/dirnames case sentsitive in Unix? Post 66446 by Perderabo on Monday 14th of March 2005 01:22:33 PM
Old 03-14-2005
Thoughout the sixties, computers were upper case only. Most printers could not print a lower case letter. Crt's were very rare, and printing terminals could not handle 2 cases. I used to enter my programs on a 029 keypunch which was upper case only.

Unix bucked the trend by supporting two cases. Look at the "stty iuclc" and "stty olcuc" commands. These show the hoops that unix had to jump through to support two cases in a one case world. I believe that they did it to support the Ascii standard which very clearly states that A and a are two different characters.

Microsoft built dos for IBM. At first it was called "PC-DOS". I think IBM wanted compatability with it's other OS's which were monocase.
 

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dosif(4)						     Kernel Interfaces Manual							  dosif(4)

NAME
DOSIF - DOS interchange format DESCRIPTION
The DOS Interchange Format (DOSIF) is the name given to the media format used by the DOS operating system. This format is based upon that used in IBM PC and PC AT and HP Vectra systems. Use the and commands to convert files between HP-UX and DOS file formats; see dos2ux(1). Use these utilities to retrieve information from a DOSIF volume. The dos*(1) utilities are the only HP-UX commands that can interact directly with the contents of a DOSIF volume. The only other way to interact with the contents of a DOSIF volume is to use an HP-UX DOS emulation or coprocessor facility such as SoftPC or the DOS Coproces- sor. The command cannot be used on a DOSIF volume because the operating system does not recognize it (see mount(1M)). When constructing file names for the dos*(1) commands, start with the HP-UX path name of the DOSIF volume, then add a colon followed by the file name: or This file naming convention is suitable for use only in arguments of the dos*(1) utilities. It does not constitute a legal path name for any other use in HP-UX applications. Metacharacters and can be used when specifying both HP-UX and DOS file names. These must be quoted when specifying a DOS file name, because file name expansion is performed by the DOS utilities, not by the shell. The dos*(1) utilities expand file names as described in regexp(5) in the section. By convention, if the HP-UX device name and a trailing colon are specified, but no file or directory name is provided (for example, the root of the DOS file system is assumed. EXAMPLES
Example 1 Specify DOSIF file accessed through HP-UX special file Example 2 Specify DOSIF file accessed through the DOS volume stored as HP-UX file SEE ALSO
dos2ux(1). dosif(4)
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