[bug #62043] The xargs -r, --no-run-if-empty Option Is Ignored When a Delimiter Is Passed

[Stephane Chazelas]

Follow-up Comment #3, bug #62043 (project findutils):

The point is that with -d '\n' an input that contains one newline character
has one empty record, and one with two newlines has 2 empty records and so
on.

With -0, an input with one newline character optionally followed by a NUL has
one record made of one newline character, an input with one NUL has one empty
record and so on.

With -0/-d, only an empty input has no record.

With neither -0/-d, an input like [newline][space][tab][newline]... has no
record, an input like '' ""  '' has 3 empty records.

So maybe a better wording could be:

-r: if the input doesn't contain any record/argument, do not run the command
once with no argument as is otherwise done by default for standard
compliance.

I would not mention *standard* input, as with -a, the input comes from a file
argument.

Note that with NetBSD xargs, the -r behaviour is the default (which makes it
non-POSIX-compliant). 

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