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HP ARPA File Transfer Protocol User's Guide: HP 3000 MPE/iX Computer Systems > Appendix A MPE/iX and POSIX DifferencesFilename Size Restrictions |
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The file reference can be either in MPE/iX or POSIX namespace. The MPE file domain consists of MPE accounts, MPE groups and files which reside in these groups.accounts. The MPE file domain is a 3 level Hierarchical File System (HFS). The POSIX file domain is considered a superset of the MPE file domain. The POSIX file domain consists of a root (/) and POSIX directories, which can contain additional directories or files. The POSIX file domain is a multi-level Hierarchical File System. POSIX is implemented on MPE/iX in such a manor that it is a superset of MPE. MPE accounts are now under the POSIX root (/) and are treated as special directories; likewise MPE groups are located under accounts and again are treated as special directories. As a result of this implementation, files in the MPE file domain can be accessed by MPE applications; and, since the POSIX file domain is a superset of the MPE file domain, POSIX applications can also access these files. In general MPE applications cannot access files in the POSIX file domain unless the application, or the file procedures it calls, are specifically coded to do so. If the file reference does not begin with a dot or a slash, it is parsed according to the MPE/iX syntax and has the following format:
MPE/iX names must contain from one to eight alphanumeric characters, beginning with an alphabetic character. If acctname is specified, you must create directory (CD) access to the target group in the account. The default groupname and acctname are the logon group and account. Filenames in MPE name space are not case sensitive, and are all shifted to uppercase. If the file reference begins with a dot (.) or a slash (/), it is parsed according to the POSIX syntax. In this case the file reference can be ./Directory 1/Directory 2/Directory 3/... . The following syntax rules apply:
For more information, refer to the New Features of MPE/iX: Using The Hierarchical File System Reference Manual for accepted syntax of file names and directories.
Example A-1 Example 1: Files in the MPE file domain in PUB.SYS (MPE syntax) are also viewed as being a part of the POSIX file domain in /SYS/PUB/ (POSIX syntax).
or
Example A-2 Example 2: Files in the POSIX file domain in "/SYS/PUB/directory1/directory2/" (POSIX syntax) are outside of the MPE file domain.
File name missing. (CIERR 531)
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