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.
MPE/iX Namespace |
 |
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:
filename [/lockword] [.groupname [.acctname]] |
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.
POSIX Namespace |
|
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:
File names are not shifted to uppercase.
File names can be up to 254 characters in length
for absolute pathnames, and 253 characters for relative pathnames.
File names can begin with, and contain, any of the
following characters:
File names can contain (but not begin with) a dash
(-).
File names are of the form (path/filename)
where the path/filename combination can have a maximum of 255 characters.
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.
| Sample File Name | MPE File Name Space | POSIX File Name Space |
|---|
| FILENAME | FILENAME | FILENAME |
| filename | FILENAME | filename |
| longfilename | Invalid MPE file name | longfilename |
| Read_Me | Invalid MPE file name | Read_Me |
|
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|
 | NOTE: The file identifiers "./FILENAME"
and "./filename" refer to two different files
in the POSIX name space since character case is accepted in the
POSIX name space. |
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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).
:listf log@.pub.sys
FILENAME
LOG LOG0112 LOG0113 |
or
:listfile /SYS/PUB/LOG@
PATH= /SYS/PUB
LOG LOG0112 LOG0113 |
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.
:listf /SYS/PUB/directory1/directory2/ |
File name missing. (CIERR 531)
:listfile /SYS/PUB/directory1/directory2
PATH= /SYS/PUB/directory1/
directory2/
PATH = /SYS/PUB/directory1/directory2/
TESTDATA |
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| |
|
| NOTE: The MPE listf command executes against
files in the MPE file domain. The MPE command listfile
created for POSIX executes against files in both the MPE and POSIX
file domains. |
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