Why sh failed 'Process Substitution'?

Dave Korn dave.korn.cygwin@googlemail.com
Tue Jun 9 09:07:00 GMT 2009


Pan ruochen wrote:
> Hi All,
> Why sh failed to recognize Process Substitution, even if /bin/sh.exe
> is a copy of /bin/bash.exe?
> $cat test.sh
> #!/bin/bash
> A="A"
> B="B"
> diff <(echo $A) <(echo $B)
> $sh test.sh
> a.sh: line 4: syntax error near unexpected token `('
> a.sh: line 4: `diff <(echo $A) <(echo $B)'

 See the section "6.11 Bash POSIX Mode" in the bash info page, item 22:
>" 22. Process substitution is not available. "

 cheers,
 DaveK
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