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ID Category Severity Type Date Submitted Last Update
0000901 [1003.1(2013)/Issue7+TC1] Shell and Utilities Editorial Enhancement Request 2014-12-04 18:56 2022-05-12 16:28
Reporter rhansen View Status public  
Assigned To
Priority normal Resolution Rejected  
Status Closed  
Name Richard Hansen
Organization BBN
User Reference
Section 2.14 'set' special built-in
Page Number 2382
Line Number 75879-75902
Interp Status ---
Final Accepted Text
Summary 0000901: reserve _POSIX* shell option namespace for future use
Description As a step towards supporting new shell features in a backward-compatible way, I would like to reserve the _POSIX* shell option (set +o) namespace.

See [^] for discussion.

Note: Zsh currently ignores case and underscores when processing shell option names. It already defines several POSIX* shell options, which means that these existing Zsh shell options are already inside the _POSIX* namespace. As far as I can tell, it is uncommon for Zsh scripts to use a leading underscore when setting/testing POSIX* options, so I do not believe it would be an unreasonable burden for Zsh to special-case shell option names beginning with _POSIX (i.e., interpret _POSIX_foo as distinct from POSIX_foo, _posix_foo, _POSIX_foo_, and _POSIX_FOO).
Desired Action After page 2382 line 75902 (XCU 2.14 description of 'set'), insert a new paragraph associated with the '-o option' item:
All other values of option beginning with _POSIX are reserved for use by POSIX.1-2008 and other POSIX standards.
Tags No tags attached.
Attached Files

- Relationships
related to 0000854Applied requirement for additional built-in utilities to be searched for via $PATH was not and is not existing practice 
related to 0001071Applied Name space reservation should move to XBD 
related to 0000935Closed warn users away from naming functions after traditional built-ins 

-  Notes
joerg (reporter)
2014-12-23 11:45

Here is the list of built-in utilities from various shells that
have been collected on the Etherpad while discussing Bugid: #854

Reserve these names (in bug 901?):

    chdir (alias for cd)
    comp* (anything begining with comp) - but not compress? NO: use the explicit list:


    help Note that "help" is part of the SCCS utilities on a historic UNIX system

    history? hist?
    source (already reserved?)
    suspend (needs to be intrinsic)
rhansen (manager)
2015-04-09 15:19

0000935 was filed to reserve the names in Note: 0002511
geoffclare (manager)
2018-01-05 10:21

Given that 0001071 has been accepted, the change requested here is probably not needed. However, I think we should keep this bug open as a fall-back option in case there are objections to 1071 at some point down the line.
kre (reporter)
2018-05-09 11:51

See note 4023 (attached to issue 1071) for an explanation why reserving namespaces
is never the right solution. Whether 1071 is finally included in issue8 or not, this
should be rejected.
kre (reporter)
2018-05-09 11:58

In addition to the list in note 2511 there are also (that I know of)

exp (more or less the same thing as let)
fdflags (manipulate the fcntl type flags on a fd, incl close-on-exec, but also append, ...)
inputrc (define file for input mappings for line editing)
jobid (converts between % job notation and process ids)
wordexp (glob code access for libc - kind of like fnmatch() but using sh to do the work)

- Issue History
Date Modified Username Field Change
2014-12-04 18:56 rhansen New Issue
2014-12-04 18:56 rhansen Name => Richard Hansen
2014-12-04 18:56 rhansen Organization => BBN
2014-12-04 18:56 rhansen Section => 2.14 'set' special built-in
2014-12-04 18:56 rhansen Page Number => 2382
2014-12-04 18:56 rhansen Line Number => 75879-75902
2014-12-04 18:56 rhansen Interp Status => ---
2014-12-04 18:58 rhansen Desired Action Updated
2014-12-11 16:21 nick Relationship added related to 0000854
2014-12-23 11:45 joerg Note Added: 0002511
2015-04-09 15:17 rhansen Relationship added related to 0000935
2015-04-09 15:19 rhansen Note Added: 0002612
2015-04-09 15:20 rhansen Note Added: 0002613
2018-01-04 17:13 rhansen Note Deleted: 0002613
2018-01-04 17:23 nick Relationship added related to 0001071
2018-01-05 10:21 geoffclare Note Added: 0003909
2018-05-09 11:51 kre Note Added: 0004024
2018-05-09 11:58 kre Note Added: 0004025
2022-05-12 16:28 geoffclare Status New => Closed
2022-05-12 16:28 geoffclare Resolution Open => Rejected

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