Single-byte restrictions
When working with a double-byte character set, you must use single-byte
characters in these situations:
- Single-byte characters for file names. DBCS characters in file names are treated as SBCS characters.
- Single-byte characters for command-line options
- Single-byte characters for command-line arguments
- Single-byte characters for delimiters, such as a slash, braces, parentheses, and so on
- For user-defined environment variables, only SBCS for the names, and SBCS or DBCS for the values
- For the shell environment variables, only IFS, PS1, and PS2 support DBCS values
- For user IDs, passwords, and password phrases
- For device, group, and terminal names.