On Thu, Jun 21, 2018 at 3:57 AM, Maximilian Pichler
<[email protected]> wrote:
> On Thu, Jun 21, 2018 at 9:48 AM, Otto Moerbeek <[email protected]> wrote:
>>> On Thu, Jun 21, 2018 at 12:11:52AM +0200, Maximilian Pichler wrote:
>>> > I'm just wondering what these other utilities might be.
>>>
>>> hexdump -v -n 1234567 -e '"%c"'
>
> Speed-wise this is roughly on par with 'dd bs=1'.
>
>>> If the input doesn't contain backslashes (or something else, tr(1))
>>>
>>> vis -aoF6 | head -n 1234567 | unvis
>
> Backslashes exist. :)
>
>> Variation that buffers the writes:
>>
>> dd ibs=1 count=n
>
> Nice, this is about three time as fast as bs=1. Both are much slower
> than 'ghead -c'.
>
Reads buffered the first 5 chars from file:
$ cat file | perl -ne 'BEGIN { $/ = \1 } print if $. <= 5; exit 0 if $. == 5'
maetel$ kdump | grep read\(0
43509 perl CALL read(0,0xc9e9996f000,0x2000)
maetel$
maetel$ kdump | grep write\(1
43509 perl CALL write(1,0xc9e0c6c5000,0x5)
maetel$
