Re: `missing' needs patch for Ultrix4.4

[Akim Demaille]

| Alexandre Oliva <address@hidden> wrote:
| | On Mar 17, 2001, Jim Meyering <address@hidden> wrote:
| |
| | >         * missing (--run): Use `eval' to run `"$@"'.  Otherwise, 
Ultrix4.4's
| | >         /bin/sh fails and outputs garbage.
| |
| | Won't this evaluate the arguments one too many times?
| 
| Thanks!  You're right.
| 
| | How about:
| |
| | prog=$1
| | shift
| | $prog ${1+"$@"} && exit 0

I was about to suggest the same.

| But wouldn't that'd have the same problem, in the unlikely event
| that $1 contains shell meta-characters.  How about this instead?

Given that "$@" is expected to be valid a valid shell command, there
should be no new problems, "$@" takes everything in charge.  In
addition, the idiom above is very common, so it must be sound.