paul vixie wrote:
On 11/26/2012 9:42 PM, Valdis(_dot_)Kletnieks(_at_)vt(_dot_)edu wrote:
Anybody who subscribes to the Linux-kernel list is going to be
deleting about 700 messages a day. So if you took a 3-day weekend you
can be looking at 2,000+ messages to delete. exmh has some
special-case code that does it in chunks of 998 messages at a time.
using argv[] to carry bulk data is gauche. if mh wants to be hacky it
can do stuff like that. if mh wants to be an example of good engineering
then it has to do something else. what it does ought ideally be portable
so, i've stumbled over rmmproc's limit in the past (and, like others,
have quietly, manually, done it in chunks instead), but i don't think
i've ever seen a similar limit with "rm". and now i'm wondering, why
not? certainly this works just fine:
$ mkdir /tmp/many
$ cd /tmp/many
$ touch $(seq 1 100000)
$ ls | wc -l
100000
$ rm *
$ ls
$
i didn't strace it, but i assume that touch and rm are both executed
just once by the shell.
to msdos, since some of us run mail clients there. this means that
(this might be the first time i've seen "runs on msdos" used as a
metric of "fine engineering". okay, you said "good", not "fine", but
still... ;-)
piping to a subprocess is fine as long as we're not expecting to execute
posix "find" or "xargs". pipes and filters and scripts should be
makeable out of mh but should not necessarily be on the inside of mh.
i'd say that things like rmmproc are fine for singleton messages but
that the caller should never use a longer argv than 10 or 20 elements.
that could mean calling it repeatedly, unless something else (new as of
this thread) like rmmpipe is available, which would take its list of
operands on stdin rather than in argv. folks who want atomicity of rmm
across sequences so that they can put the same timestamp on each message
as they trash it, would have the burden of reworking their scripts to
work as rmmpipe rather than rmmproc.
paul
--
"When challenging a Kzin, a simple scream of rage will suffice. You scream
and you leap."
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=---------------------
paul fox, pgf(_at_)foxharp(_dot_)boston(_dot_)ma(_dot_)us (arlington, ma,
where it's 33.6 degrees)
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