On Tue, May 28, 2013 at 11:48:47AM +0200, Václav Zeman wrote: > On 27 May 2013 21:58, Reid Linnemann wrote: > > from SH(1)
> > "Note that unlike some other shells, sh executes each process in a pipe- > > line with more than one command in a subshell environment and as a > > child > > of the sh process." > > I'm taking this to mean that redirecting to sh_f has sh_f execute in > > a subshell in which global_scope_var changes, but the original > > shell's copy is uncahnged. > Curious. Which of the two behaviours is POSIXly correct? Both. As per XCU 2.12 Shell Execution Environment, each command in a multi-command pipeline may or may not be executed in a subshell environment. Behaviour different from our sh is most often encountered in the various versions of the real Korn shell (ksh88 and ksh93), which execute the last command in a pipeline in the current shell environment. If things like jobs | cat work, that can also be explained using this rule. -- Jilles Tjoelker _______________________________________________ freebsd-hackers@freebsd.org mailing list http://lists.freebsd.org/mailman/listinfo/freebsd-hackers To unsubscribe, send any mail to "freebsd-hackers-unsubscr...@freebsd.org"
