El viernes, 27 de julio de 2018, 17:20:41 (UTC+3), Chet Ramey escribió: > On 7/27/18 7:00 AM, Hugo Gabriel Eyherabide wrote: > > > Bash Version: 4.3 > > Patch Level: 48 > > Release Status: release > > > > Description: > > After reading the documentation in "help shopt" I attempted to set > > flags, for example, noclobber, by using "shopt -s noclobber", but got an > > error message. I've found that I can do that by using "shopt -s -o > > -noclobber" but that the help provided me no indication that the additional > > "-o" was actually necessary. > > > > Repeat-By: > > Using "shopt -s noclobber" (or any optname) instead of "shopt -s -o > > noclobber). > > There is a set of option names for use by `set -o' (mostly the ones > corresponding to `set' options and those defined by POSIX) and a bash- > specific set available for use with `shopt'. Read the documentation to > tell the difference. >
The problem is that the documentation and the help are not entirely consistent. In particular, the help for -o stated that it 'restricts', as opposed to 'requires', OPTNAMEs to those defined for use with `set -o'. It is not a matter of not understanding the difference between the optnames, but a matter of the help, as opposed to the documentation being ambiguous and inconsistent. Which one should be trusted then: the help or the documentation? Of course, the source code. > > > > Fix: > > I would suggest to change the help of shopt so that it says [-o > > [optname ...] ] instead of [-o] [optname ...], and change the help where > > relevant. > > That would be wrong. > Indeed, but should have given a clue on how to solve the problem. Perhaps using [optnameposix | -o optnameset] or something else. > -- > ``The lyf so short, the craft so long to lerne.'' - Chaucer > ``Ars longa, vita brevis'' - Hippocrates > Chet Ramey, UTech, CWRU c...@case.edu http://tiswww.cwru.edu/~chet/
