Re: input redirection in subshell before command results in error

[Chet Ramey]

Andrew Brown wrote:

> Bash Version: 2.05b
> Patch Level: 0
> Release Status: release
>
>     postconf | ( 3<&0 ( postconf -d | diff - /dev/fd/3 ) )
>
> this works in netbsd's sh, solaris's /bin/sh (and solaris's /sbin/sh
> and /usr/xpg4/bin/sh), and in irix's sh, at the very least, along with
> ksh and zsh.  the error given is:
>
>     bash: -c: line 1: syntax error near unexpected token `('
>     bash: -c: line 1: `postconf | ( 3<&0 ( postconf -d | diff - /dev/fd/3 ) )'
>
> Repeat-By:
>
>     postconf | ( 3<&0 ( postconf -d | diff - /dev/fd/3 ) )

Please read the answer to question F5 in the Bash FAQ.

Chet