why doesnt it accept ! after | On Thu, May 27, 2021, 17:38 Chet Ramey <chet.ra...@case.edu> wrote:
> On 5/27/21 11:20 AM, Andreas Schwab wrote: > > On Mai 27 2021, Chet Ramey wrote: > > > >> On 5/26/21 9:55 PM, Dale R. Worley wrote: > >> > >>>> $ ! ! [ 1 -eq 1 ]; echo $? > >>>> 0 > >>> That last one isn't defined by the manual page. I'm surprised you > don't > >>> get a syntax error. > >> > >> It's clearly valid. > > > > According to the POSIX grammar, a pipeline can only be a pipe_sequence > > optionally preceded by a single Bang. If you want another Bang the > > pipe_sequnce needs to be either a subshell or a brace_group. > > True, but bash accepts it. (So do ksh and mksh; dash and yash do not.) > > > -- > ``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/ > >
