Re: strange `printf` arguments, parsing features (bugs?)

2008-05-18 Thread Herbert Xu 
On Sun, May 18, 2008 at 06:40:26PM +0200, Oleg Verych wrote:
 Herbert Xu @ Sun, May 18, 2008 at 11:41:08PM +0800:
 
   # (1) parameters to `printf`?
   
   [EMAIL PROTECTED]:/tmp$ sh -c 'printf -1'
   printf: 1: Illegal option -1
  
  This is expected.  Use printf -- if you want to disable option parsing.
 
 [second] Again for `echo` it's not so, `printf` is a mean for propper
  (portable) `echo`, nothing about getopt() stuff is mentioned in
POSIX spec.

All POSIX utilities accept -- by default.  The specification for
echo specifically forbids --, while that of printf does not.

   # (3) '\' in `` and in $();
   # what is POSIX literal meaning of '\' in `` and what is '\\' then?
 (bash removed)
 
 $( '  ' ) ; ` '  ' ` ; $( ' \\\ ' ) ; ` ' \\\ ' `
   (4)(2)(3)   (2)
 $(    ) ; `    ` ; $(  \\\  ) ; `  \\\  `
 
 it is so, but how to explain this wrt spec.?

Section 2.6.3, Command Substitution:

Within the backquoted style of command substitution, backslash
shall retain its literal meaning, except when followed by:
'$', '`', or '\\' (dollar sign, backquote, backslash).

Cheers,
-- 
Visit Openswan at http://www.openswan.org/
Email: Herbert Xu ~{PmVHI~} [EMAIL PROTECTED]
Home Page: http://gondor.apana.org.au/~herbert/
PGP Key: http://gondor.apana.org.au/~herbert/pubkey.txt
--
To unsubscribe from this list: send the line unsubscribe dash in
the body of a message to [EMAIL PROTECTED]
More majordomo info at  http://vger.kernel.org/majordomo-info.html

Re: strange `printf` arguments, parsing features (bugs?)

2008-05-18 Thread Herbert Xu 
Oleg Verych [EMAIL PROTECTED] wrote:

 Or, if you want to have a slash (odd number), use slash (same). If you
 what to place two slashes (even), use four (even  1).
 
 Nice.

Yes it is confusing, however, the `` construct is deprecated
and the $() construct is more reasonable in this regard.

Cheers,
-- 
Visit Openswan at http://www.openswan.org/
Email: Herbert Xu ~{PmVHI~} [EMAIL PROTECTED]
Home Page: http://gondor.apana.org.au/~herbert/
PGP Key: http://gondor.apana.org.au/~herbert/pubkey.txt
--
To unsubscribe from this list: send the line unsubscribe dash in
the body of a message to [EMAIL PROTECTED]
More majordomo info at  http://vger.kernel.org/majordomo-info.html