Re: binfmt_script and ^M

[Andreas Schwab <schwab@suse.de>]

Paul Flinders <paul@dawa.demon.co.uk> writes:

|> Andreas Schwab wrote:
|> 
|> > This [isspace('\r') == 1] has no significance here.  The right thing to
|> 
|> > look at is $IFS, which does not contain \r by default.  The shell only splits
|> 
|> > words by "IFS whitespace", and the kernel should be consistent with it:
|> >
|> > $ echo -e 'ls foo\r' | sh
|> > ls: foo: No such file or directory
|> 
|> The problem with that argument is that #!<interpreter> can be applied
|> to more than just shells which understand $IFS, so which environment
|> variable does the kernel pick?

The kernel should use the same default value of IFS as the Bourne shell,
ie. the same value you'll get with /bin/sh -c 'echo "$IFS"'.  This is
independent of any settings in the environment.

|> It's a difficult one - logically white space should terminate the interpreter

No, IFS-whitespace delimits arguments in the Bourne shell.

Andreas.

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