27 Jun
2023
27 Jun
'23
12:28 p.m.
My approach would have been to use "split" on the original file and then dd
the resulting files. But now I find myself wondering how old "split" is.
It was certainly already a well-established thing by the early 90s.
On Mon, Jun 26, 2023 at 11:23 PM Ralph Corderoy <ralph(a)inputplus.co.uk>
wrote:
Hi Steve,
I’ve never figured out how to use ‘dd’ so it
returns after a single
block is written doesn’t close the input, killing the pipeline, or
cause the rest of the data to be discarded.
I think this meets your description and complies with POSIX's dd(1p)
here.
$ seq 33 126 | sed 's/$/P/' | dc |
while :; do
LC_ALL=C dd bs=10 count=1 2>dd.err | sed -n l
grep -q '^[^0].* records in$' dd.err || break
done
!"#$%&'()*$
+,-./01234$
56789:;<=>$
?@ABCDEFGH$
IJKLMNOPQR$
STUVWXYZ[\\$
]^_`abcdef$
ghijklmnop$
qrstuvwxyz$
{|}~$
$
$ rm dd.err
I set the locale so the format of dd's stderr report is known.
--
Cheers, Ralph.