On Tue, 13 Dec 2011 00:16:39 +0000
Andrew Benton <[email protected]> wrote:

> On Mon, 12 Dec 2011 15:34:42 -0600
> Bruce Dubbs <[email protected]> wrote:
> 
> > Then why is is working for me?   Note 'sed -ir'
> 
> Sorry, I hadn't noticed the -r
> 
> > $cat sedtest
> > USEDLIBS module.a
> > 
> > $ cat sedtest | sed -r -e '/^USEDLIBS/s# ([A-Za-z]*).a# -l\1#g'
> > USEDLIBS -lmodule
> 
> Works the same here, but I don't know why. According to:
> http://en.wikipedia.org/wiki/Regular_expression#POSIX_Extended_Regular_Expressions
> 
> "support is removed for \n backreferences", but if that's true then why
> does the backreference work?
> 
> Andy

However, when I try the commands as they are in the book I get this:

configure: creating ./config.status
config.status: creating Makefile.common
config.status: executing setup commands
config.status: executing Makefile commands
config.status: executing lib/Makefile commands
config.status: executing lib/sample/Makefile commands
config.status: executing tools/Makefile commands
config.status: executing tools/sample/Makefile commands
sed: -e expression #3, char 35: invalid reference \1 on `s' command's RHS
sed: -e expression #3, char 35: invalid reference \1 on `s' command's RHS
sed: -e expression #3, char 35: invalid reference \1 on `s' command's RHS
sed: -e expression #3, char 35: invalid reference \1 on `s' command's RHS
sed: -e expression #3, char 35: invalid reference \1 on `s' command's RHS
sed: -e expression #3, char 35: invalid reference \1 on `s' command's RHS
sed: -e expression #3, char 35: invalid reference \1 on `s' command's RHS
sed: -e expression #3, char 35: invalid reference \1 on `s' command's RHS
sed: -e expression #3, char 35: invalid reference \1 on `s' command's RHS
sed: -e expression #3, char 35: invalid reference \1 on `s' command's RHS
sed: -e expression #3, char 35: invalid reference \1 on `s' command's RHS
sed: -e expression #3, char 35: invalid reference \1 on `s' command's RHS
sed: -e expression #3, char 35: invalid reference \1 on `s' command's RHS
sed: -e expression #3, char 35: invalid reference \1 on `s' command's RHS
sed: -e expression #3, char 35: invalid reference \1 on `s' command's RHS
sed: -e expression #3, char 35: invalid reference \1 on `s' command's RHS
sed: -e expression #3, char 35: invalid reference \1 on `s' command's RHS
sed: -e expression #3, char 35: invalid reference \1 on `s' command's RHS
sed: -e expression #3, char 35: invalid reference \1 on `s' command's RHS
sed: -e expression #3, char 35: invalid reference \1 on `s' command's RHS
sed: -e expression #3, char 35: invalid reference \1 on `s' command's RHS
sed: -e expression #3, char 35: invalid reference \1 on `s' command's RHS
sed: -e expression #3, char 35: invalid reference \1 on `s' command's RHS
sed: -e expression #3, char 35: invalid reference \1 on `s' command's RHS
sed: -e expression #3, char 35: invalid reference \1 on `s' command's RHS
sed: -e expression #3, char 35: invalid reference \1 on `s' command's RHS
sed: -e expression #3, char 35: invalid reference \1 on `s' command's RHS
sed: -e expression #3, char 35: invalid reference \1 on `s' command's RHS
sed: -e expression #3, char 35: invalid reference \1 on `s' command's RHS
sed: -e expression #3, char 35: invalid reference \1 on `s' command's RHS
sed: -e expression #3, char 35: invalid reference \1 on `s' command's RHS
sed: -e expression #3, char 35: invalid reference \1 on `s' command's RHS
sed: -e expression #3, char 35: invalid reference \1 on `s' command's RHS
sed: -e expression #3, char 35: invalid reference \1 on `s' command's RHS
sed: -e expression #3, char 35: invalid reference \1 on `s' command's RHS
sed: -e expression #3, char 35: invalid reference \1 on `s' command's RHS
sed: -e expression #3, char 35: invalid reference \1 on `s' command's RHS
sed: -e expression #3, char 35: invalid reference \1 on `s' command's RHS
sed: -e expression #3, char 35: invalid reference \1 on `s' command's RHS
sed: -e expression #3, char 35: invalid reference \1 on `s' command's RHS
sed: -e expression #3, char 35: invalid reference \1 on `s' command's RHS
sed: -e expression #3, char 35: invalid reference \1 on `s' command's RHS
sed: -e expression #3, char 35: invalid reference \1 on `s' command's RHS
sed: -e expression #3, char 35: invalid reference \1 on `s' command's RHS
sed: -e expression #3, char 35: invalid reference \1 on `s' command's RHS
sed: -e expression #3, char 35: invalid reference \1 on `s' command's RHS
sed: -e expression #3, char 35: invalid reference \1 on `s' command's RHS
sed: -e expression #3, char 35: invalid reference \1 on `s' command's RHS
sed: -e expression #3, char 35: invalid reference \1 on `s' command's RHS
sed: -e expression #3, char 35: invalid reference \1 on `s' command's RHS
sed: -e expression #3, char 35: invalid reference \1 on `s' command's RHS
sed: -e expression #3, char 35: invalid reference \1 on `s' command's RHS
sed: -e expression #3, char 35: invalid reference \1 on `s' command's RHS
sed: -e expression #3, char 35: invalid reference \1 on `s' command's RHS
sed: -e expression #3, char 35: invalid reference \1 on `s' command's RHS
sed: -e expression #3, char 35: invalid reference \1 on `s' command's RHS
sed: -e expression #3, char 35: invalid reference \1 on `s' command's RHS
sed: -e expression #3, char 35: invalid reference \1 on `s' command's RHS
sed: -e expression #3, char 35: invalid reference \1 on `s' command's RHS
sed: -e expression #3, char 35: invalid reference \1 on `s' command's RHS
sed: -e expression #3, char 35: invalid reference \1 on `s' command's RHS
sed: -e expression #3, char 35: invalid reference \1 on `s' command's RHS
sed: -e expression #3, char 35: invalid reference \1 on `s' command's RHS
sed: -e expression #3, char 35: invalid reference \1 on `s' command's RHS
sed: -e expression #3, char 35: invalid reference \1 on `s' command's RHS
sed: -e expression #3, char 35: invalid reference \1 on `s' command's RHS
sed: -e expression #3, char 35: invalid reference \1 on `s' command's RHS
sed: -e expression #3, char 35: invalid reference \1 on `s' command's RHS
sed: -e expression #3, char 35: invalid reference \1 on `s' command's RHS
sed: -e expression #3, char 35: invalid reference \1 on `s' command's RHS
sed: -e expression #3, char 35: invalid reference \1 on `s' command's RHS
sed: -e expression #3, char 35: invalid reference \1 on `s' command's RHS
sed: -e expression #3, char 35: invalid reference \1 on `s' command's RHS
sed: -e expression #3, char 35: invalid reference \1 on `s' command's RHS
sed: -e expression #3, char 35: invalid reference \1 on `s' command's RHS
sed: -e expression #3, char 35: invalid reference \1 on `s' command's RHS
sed: -e expression #3, char 35: invalid reference \1 on `s' command's RHS
sed: -e expression #3, char 35: invalid reference \1 on `s' command's RHS
sed: -e expression #3, char 35: invalid reference \1 on `s' command's RHS
sed: -e expression #3, char 35: invalid reference \1 on `s' command's RHS
sed: -e expression #3, char 35: invalid reference \1 on `s' command's RHS
sed: -e expression #3, char 35: invalid reference \1 on `s' command's RHS
sed: -e expression #3, char 35: invalid reference \1 on `s' command's RHS
sed: -e expression #3, char 35: invalid reference \1 on `s' command's RHS
sed: -e expression #3, char 35: invalid reference \1 on `s' command's RHS
sed: -e expression #3, char 35: invalid reference \1 on `s' command's RHS
sed: -e expression #3, char 35: invalid reference \1 on `s' command's RHS
sed: -e expression #3, char 35: invalid reference \1 on `s' command's RHS
sed: -e expression #3, char 35: invalid reference \1 on `s' command's RHS
sed: -e expression #3, char 35: invalid reference \1 on `s' command's RHS
sed: -e expression #3, char 35: invalid reference \1 on `s' command's RHS
sed: -e expression #3, char 35: invalid reference \1 on `s' command's RHS
sed: -e expression #3, char 35: invalid reference \1 on `s' command's RHS
sed: -e expression #3, char 35: invalid reference \1 on `s' command's RHS
sed: -e expression #3, char 35: invalid reference \1 on `s' command's RHS
sed: -e expression #3, char 35: invalid reference \1 on `s' command's RHS
sed: -e expression #3, char 35: invalid reference \1 on `s' command's RHS
sed: -e expression #3, char 35: invalid reference \1 on `s' command's RHS
sed: -e expression #3, char 35: invalid reference \1 on `s' command's RHS
sed: -e expression #3, char 35: invalid reference \1 on `s' command's RHS
sed: -e expression #3, char 35: invalid reference \1 on `s' command's RHS
sed: -e expression #3, char 35: invalid reference \1 on `s' command's RHS
sed: -e expression #3, char 35: invalid reference \1 on `s' command's RHS
sed: -e expression #3, char 35: invalid reference \1 on `s' command's RHS
sed: -e expression #3, char 35: invalid reference \1 on `s' command's RHS
sed: -e expression #3, char 35: invalid reference \1 on `s' command's RHS
sed: -e expression #3, char 35: invalid reference \1 on `s' command's RHS
sed: -e expression #3, char 35: invalid reference \1 on `s' command's RHS
sed: -e expression #3, char 35: invalid reference \1 on `s' command's RHS
sed: -e expression #3, char 35: invalid reference \1 on `s' command's RHS
sed: -e expression #3, char 35: invalid reference \1 on `s' command's RHS
sed: -e expression #3, char 35: invalid reference \1 on `s' command's RHS
sed: -e expression #3, char 35: invalid reference \1 on `s' command's RHS
sed: -e expression #3, char 35: invalid reference \1 on `s' command's RHS
sed: -e expression #3, char 35: invalid reference \1 on `s' command's RHS
sed: -e expression #3, char 35: invalid reference \1 on `s' command's RHS
sed: -e expression #3, char 35: invalid reference \1 on `s' command's RHS
sed: -e expression #3, char 35: invalid reference \1 on `s' command's RHS
sed: -e expression #3, char 35: invalid reference \1 on `s' command's RHS
sed: -e expression #3, char 35: invalid reference \1 on `s' command's RHS
sed: -e expression #3, char 35: invalid reference \1 on `s' command's RHS
sed: -e expression #3, char 35: invalid reference \1 on `s' command's RHS
sed: -e expression #3, char 35: invalid reference \1 on `s' command's RHS
sed: -e expression #3, char 35: invalid reference \1 on `s' command's RHS
sed: -e expression #3, char 35: invalid reference \1 on `s' command's RHS
sed: -e expression #3, char 35: invalid reference \1 on `s' command's RHS
sed: -e expression #3, char 35: invalid reference \1 on `s' command's RHS
sed: -e expression #3, char 35: invalid reference \1 on `s' command's RHS
sed: -e expression #3, char 35: invalid reference \1 on `s' command's RHS
sed: -e expression #3, char 35: invalid reference \1 on `s' command's RHS
sed: -e expression #3, char 35: invalid reference \1 on `s' command's RHS
sed: -e expression #3, char 35: invalid reference \1 on `s' command's RHS
sed: -e expression #3, char 35: invalid reference \1 on `s' command's RHS
sed: -e expression #3, char 35: invalid reference \1 on `s' command's RHS
sed: -e expression #3, char 35: invalid reference \1 on `s' command's RHS
sed: -e expression #3, char 35: invalid reference \1 on `s' command's RHS
sed: -e expression #3, char 35: invalid reference \1 on `s' command's RHS
sed: -e expression #3, char 35: invalid reference \1 on `s' command's RHS
sed: -e expression #3, char 35: invalid reference \1 on `s' command's RHS
sed: -e expression #3, char 35: invalid reference \1 on `s' command's RHS
sed: -e expression #3, char 35: invalid reference \1 on `s' command's RHS
sed: -e expression #3, char 35: invalid reference \1 on `s' command's RHS
sed: -e expression #3, char 35: invalid reference \1 on `s' command's RHS
sed: -e expression #3, char 35: invalid reference \1 on `s' command's RHS
sed: -e expression #3, char 35: invalid reference \1 on `s' command's RHS
sed: -e expression #3, char 35: invalid reference \1 on `s' command's RHS
sed: -e expression #3, char 35: invalid reference \1 on `s' command's RHS
sed: -e expression #3, char 35: invalid reference \1 on `s' command's RHS
sed: -e expression #3, char 35: invalid reference \1 on `s' command's RHS
sed: -e expression #3, char 35: invalid reference \1 on `s' command's RHS
sed: -e expression #3, char 35: invalid reference \1 on `s' command's RHS
sed: -e expression #3, char 35: invalid reference \1 on `s' command's RHS
sed: -e expression #3, char 35: invalid reference \1 on `s' command's RHS
sed: -e expression #3, char 35: invalid reference \1 on `s' command's RHS
sed: -e expression #3, char 35: invalid reference \1 on `s' command's RHS
sed: -e expression #3, char 35: invalid reference \1 on `s' command's RHS
sed: -e expression #3, char 35: invalid reference \1 on `s' command's RHS
sed: -e expression #3, char 35: invalid reference \1 on `s' command's RHS
sed: -e expression #3, char 35: invalid reference \1 on `s' command's RHS
sed: -e expression #3, char 35: invalid reference \1 on `s' command's RHS
sed: -e expression #3, char 35: invalid reference \1 on `s' command's RHS
sed: -e expression #3, char 35: invalid reference \1 on `s' command's RHS
sed: -e expression #3, char 35: invalid reference \1 on `s' command's RHS
sed: -e expression #3, char 35: invalid reference \1 on `s' command's RHS
sed: -e expression #3, char 35: invalid reference \1 on `s' command's RHS
sed: -e expression #3, char 35: invalid reference \1 on `s' command's RHS
sed: -e expression #3, char 35: invalid reference \1 on `s' command's RHS
sed: -e expression #3, char 35: invalid reference \1 on `s' command's RHS
sed: -e expression #3, char 35: invalid reference \1 on `s' command's RHS
sed: -e expression #3, char 35: invalid reference \1 on `s' command's RHS
sed: -e expression #3, char 35: invalid reference \1 on `s' command's RHS
sed: -e expression #3, char 35: invalid reference \1 on `s' command's RHS
sed: -e expression #3, char 35: invalid reference \1 on `s' command's RHS
sed: -e expression #3, char 35: invalid reference \1 on `s' command's RHS
sed: -e expression #3, char 35: invalid reference \1 on `s' command's RHS
sed: -e expression #3, char 35: invalid reference \1 on `s' command's RHS
sed: -e expression #3, char 35: invalid reference \1 on `s' command's RHS
sed: -e expression #3, char 35: invalid reference \1 on `s' command's RHS
sed: -e expression #3, char 35: invalid reference \1 on `s' command's RHS
sed: -e expression #3, char 35: invalid reference \1 on `s' command's RHS
sed: -e expression #3, char 35: invalid reference \1 on `s' command's RHS
sed: -e expression #3, char 35: invalid reference \1 on `s' command's RHS
sed: -e expression #3, char 35: invalid reference \1 on `s' command's RHS
sed: -e expression #3, char 35: invalid reference \1 on `s' command's RHS
sed: -e expression #3, char 35: invalid reference \1 on `s' command's RHS
sed: -e expression #3, char 35: invalid reference \1 on `s' command's RHS
sed: -e expression #3, char 35: invalid reference \1 on `s' command's RHS
andy@eccles:~/llvm-3.0.src$ 

Andy
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