[Bug 15146] New: xargs: Allow running interactive commands with -o [PATCH]

[bugzilla at busybox.net]

https://bugs.busybox.net/show_bug.cgi?id=15146

            Bug ID: 15146
           Summary: xargs: Allow running interactive commands with -o
                    [PATCH]
           Product: Busybox
           Version: unspecified
          Hardware: All
                OS: All
            Status: NEW
          Severity: enhancement
          Priority: P5
         Component: Other
          Assignee: unassigned at busybox.net
          Reporter: malloryadams at fastmail.com
                CC: busybox-cvs at busybox.net
  Target Milestone: ---

Created attachment 9416
  --> https://bugs.busybox.net/attachment.cgi?id=9416&action=edit
Patch to add -o support
https://github.com/MalloryA/busybox/commit/2b66ae249d87c3b1c427cc87862ad6612b27c271

-o opens /dev/tty and connects it to the stdin of the commands that get
executed.

Example: say we want to delete some files interactively. We cannot do
that with xargs without the -o option because the `rm -i` command does
not receive an interactive stdin. But if we add `-o`, then xargs will
ensure that /dev/tty is connected as stdin and `rm -i` will show us a
prompt and wait:

```
% touch a b c
% echo a b c | xargs -o rm -i
```

The -o option is available in GNU and FreeBSD versions of xargs as non-POSIX
extensions.

Attached is a patch generated by `git format-patch`. I put the same patch on
GitHub too:
https://github.com/MalloryA/busybox/commit/2b66ae249d87c3b1c427cc87862ad6612b27c271

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