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On Fri, 14 Sep 2001 at 07:03:19 -0400, David T-G wrote:
> % ---BEGIN---
> % #!/bin/sh
> ...
> % pgp $* 2>$PGP_ERR 1>$PGP_OUT
>=20
> BTW, you might want to modify your script to protect any arguments with
> embedded spaces. Change the line above to
>=20
> pgp ${1+"$@"} 2>$PGP_ERR 1>$PGP_OUT
>=20
> and you're golden.
It's much more straightforward to use:
pgp "$@" [...]
actually. :)
> [BTW, I haven't *yet* found this in any shell documentation since I
> saw it in a shell programming tip; can anyone provide me a pointer for
> further research?]
I daresay you haven't been looking hard enough. :)
Quoting FreeBSD's "man sh" [from the listing of special parameters]:
| @ Expands to the positional parameters, starting from one.
| When the expansion occurs within double-quotes, each
| positional parameter expands as a separate argument. If
| there are no positional parameters, the expansion of @
| generates zero arguments, even when @ is double-quoted.
| What this basically means, for example, is if $1 is ``abc''
| and $2 is ``def ghi'', then "$@" expands to the two
| arguments:
| "abc" "def ghi"
As for further research, i generally got by on the sh and bash manpages
up till now. They're generally very concentrated in terms of info, and
take a while to sink in. I find myself realizing new things all the
time when i'm (re-)reading them. :-)
(Prominent example: just now while writing this mail, i saw for the
first time how ${1+"$@"} works. Ingenious approach, even if a bit
redundant. Most probably in the context of the tip you found it in it
was a workaround for a shell that didn't handle a plain "$@" correctly?)
--=20
Piet Delport <[EMAIL PROTECTED]>
Today's subliminal thought is:
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