Nicolas Sebrecht <nicolas.s.dev@xxxxxx> writes:
> I don't see the reason to have the option -v. It's only related to
> what's printed to output and doesn't change the exit status which
> tell us if an expression has matched.
>
> This gives:
>
> grep -E -e '^[A-Za-z]+(-[A-Za-z]+)*:' >/dev/null &&
> patch_format=mbox
That grep says "if you see a single line that matches the pattern, even if
all the other lines are garbage, report it as a match".
See "something like this" patch in my other message. It filters the entire
header to make sure there is no line that does not match (that is what -v
is about), and make it report success when there is even a signle line
that does not.
$ (echo yes; echo no) | grep -v -e yes ; echo $?
no
0
$ (echo yes; echo yes) | grep -v -e yes ; echo $?
1
That is why I wrote the "how about this" patch with "||" like this:
grep -v -E -e '^[A-Za-z]+(-[A-Za-z]+)*:' >/dev/null ||
patch_format=mbox
If everything is header, grep says "nothing matches", and patch_format
is set to mbox.
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