Date: Fri, 28 Jan 2005 00:07:56 -0800 From: Julian Elischer <julian@elischer.org> To: Current <freebsd-current@freebsd.org> Subject: sh bug? Message-ID: <41F9F2DC.7000907@elischer.org>
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the man page for sh says:
----------------------------------------------------------------
Grouping Commands Together
Commands may be grouped by writing either
(list)
or
{ list; }
The first form executes the commands in a subshell. Note that built-in
commands thus executed do not affect the current shell. The second form
does not fork another shell, so it is slightly more efficient. Grouping
commands together this way allows the user to redirect their output as
though they were one program:
{ echo -n "hello"; echo " world"; } > greeting
-----------------------------------------------------------------------
however echo $$
and
( echo $$ )
produce the same result.
in addition,
ps -l
and
( ps -l )
show the same parent process for 'ps'
so it looks to me that () is acting the same as {}
and that neither is forking a new shell.
am I missing something?
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