evaluating ${10} and above in sh/ksh

[Maarten Litmaath]

In article <514 at risky.Convergent.COM>,
	chrisb at risky.Convergent.COM (Chris Bertin) writes:
)There doesn't seem to be a way, in sh or ksh, to evaluate $10 and higher.
)$10 and higher are evaluated as ${1}0, ${1}1, etc...
)		     instead of ${10}, ${11}, etc...

Alas...  POSIX fixes this though: ${10} will work.

)I have tried many different ways and they all fail. Do you know one
)that will work?

	set a b c d e f g h i j k l m

	argv()
	{
		shift $1 2> /dev/null
		echo "$1"
	}

	echo `argv 10 "$@"`
	echo `argv 11 "$@"`
	echo `argv 20 "$@"`

Beware of "$@": many shells will expand it to a single null string if
there are no positional parameters present at all!  A safe workaround
is:
	${1+"$@"}

Check it out in the manual!
--
   "UNIX was never designed to keep people from doing stupid things, because
    that policy would also keep them from doing clever things."  (Doug Gwyn)