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Groups > comp.os.linux.misc > #90443
| From | "Carlos E.R." <robin_listas@es.invalid> |
|---|---|
| Newsgroups | comp.os.linux.misc |
| Subject | Re: /dev/tcp |
| Date | 2026-08-24 09:35 +0200 |
| Organization | Tebibyte_Retro_Gaming |
| Message-ID | <6r8tlmxeb9.ln2@Telcontar.valinor> (permalink) |
| References | (6 earlier) <116dggf$1idoq$1@dont-email.me> <116draf$1ktfi$2@dont-email.me> <5b2dnb6l8sPvPhf3nZ2dnZfqnPGdnZ2d@giganews.com> <6d3rlmxqg4.ln2@Telcontar.valinor> <116fs5p$28rhg$2@dont-email.me> |
On 2026-08-24 00:28, vallor wrote:
> At Sun, 23 Aug 2026 13:50:30 +0200, "Carlos E.R." <robin_listas@es.invalid> wrote:
>
>> On 2026-08-23 09:37, c186282 wrote:
>>> On 8/23/26 00:01, Rich wrote:
>>>> vallor <vallor@vallor.earth> wrote:
>>>>> At Thu, 20 Aug 2026 23:30:40 -0000 (UTC), Lawrence D’Oliveiro
>>>>> <ldo@nz.invalid> wrote:
>>>>>
>>>>>> On Thu, 20 Aug 2026 18:15:27 -0000 (UTC), Eli the Bearded wrote:
>>>>>>
>>>>>>> In comp.os.linux.misc, Lawrence DOliveiro <ldo@nz.invalid> wrote:
>>>>>>>>
>>>>>>>> On Thu, 20 Aug 2026 00:59:41 -0000 (UTC), Eli the Bearded wrote:
>>>>>>>>>
>>>>>>>>> This came up in the context of "how to test network on a system
>>>>>>>>> with no root and no helpful utilities installed."
>>>>>>>>
>>>>>>>> So a version of bash that supports /dev/tcp is somehow excluded
>>>>>>>> from that “no helpful utilities installed” assumption?
>>>>>>>
>>>>>>> The system being tested did not have bash installed. Busybox
>>>>>>> provided /bin/sh there.
>>>>>>
>>>>>> I thought you said you were testing the *network*, not the *system*.
>>>>>>
>>>>>> You can’t really do that (in general) without access to a proper
>>>>>> suite of diagnostic tools.
>>>>>>
>>>>>> In such a situation, I would try one (or both) of two things:
>>>>>>
>>>>>> * Reboot the machine with a SystemRescue USB stick
>>>>>> <https://www.system-rescue.org/>. That way, I get unconstrained
>>>>>> access to an entire system custom-designed precisely for running
>>>>>> diagnostics.
>>>>>> * Bring in my own machine, which already has my own custom setup on
>>>>>> it, and connect it to the network.
>>>>>>
>>>>>> Both of these also have the advantage of ruling out screwups in the
>>>>>> existing OS installation.
>>>>>>
>>>>>> And if you’re saying the situation would not allow me to do either of
>>>>>> these things, then I would not have accepted the job in the first
>>>>>> place.
>>>>>
>>>>> Have you ever agreed with someone?
>>>>
>>>> It's kind of the troll ethos, disagreeing brings on more chaos.
>>>
>>>
>>> There are always a few ... being negative/disagreeable
>>> or, worse, All-Superior is Their Main Thing. They feel
>>> they "Gain Power" that way.
>>>
>>> No, I'm not basing that on Freud or Jung - just long
>>> experience.
>>>
>>> I pref the "Let's All Get Along" approach. Everything
>>> goes MUCH smoother and solutions, rather than conflict,
>>> is the usual result.
>>>
>>> ANYway, /dev/tcp does have uses. It's worth exploring.
>>> Maybe YOU can find a use to suit YOUR needs/desires.
>>> I used it for a custom disk-scan/wipe app (had to
>>> use a 'C' module because huge track/cluster/byte numbers
>>> were needed for modern mag drives - the main app was
>>> in Lazarus for the pretty display and buttons).
>>>
>>> Note Lazarus/FPC *says* it supports huge seek numbers
>>> but DOESN'T ... limited to maybe 4gb.
>>
>> I wrote a program that writes bytes on big partitions.
>>
>>
>> excerpted:
>>
>> const
>> sourcefilename = './BigRandom';
>> rawdest: string = ''; // example: '/dev/sda11'
>>
>> shuflecount = 1024;
>> arraysize = 1023;
>> ChunkSz=1048576;
>> type
>> tCacho= array [1..ChunkSz] of byte;
>>
>> var
>> Fin, Fout: file of tCacho;
>> gotresult: Word;
>>
>> BigData : array [1..shuflecount] of tCacho;
>> OutputIndex : Int64; // counts MiB written.
>>
>>
>> begin
>>
>> // writes one MiB
>> {$I-}write(Fout,BigData[RandomIndex]);{$I+}
>> gotresult:= ioresult;
>>
>>
>>
>> The purpose of the program is to fast fill a partition or disk with
>> nearly true random data. It is as fast as dd could be.
>
> SHRED(1) User Commands SHRED(1)
>
> NAME
> shred - overwrite a file to hide its contents, and
> optionally delete it
>
> SYNOPSIS
> shred [OPTION]... FILE...
>
> DESCRIPTION
> Overwrite the specified FILE(s) repeatedly, in order to
> make it harder for even very expensive hardware probing
> to recover the data.
Not the same thing.
--
Cheers, Carlos.
ES🇪🇸, EU🇪🇺;
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/dev/tcp Eli the Bearded <*@eli.users.panix.com> - 2026-08-19 21:20 +0000
Re: /dev/tcp Richard Kettlewell <invalid@invalid.invalid> - 2026-08-19 23:53 +0100
Re: /dev/tcp Lawrence D’Oliveiro <ldo@nz.invalid> - 2026-08-19 23:42 +0000
Re: /dev/tcp Eli the Bearded <*@eli.users.panix.com> - 2026-08-20 00:59 +0000
Re: /dev/tcp Lawrence D’Oliveiro <ldo@nz.invalid> - 2026-08-20 03:59 +0000
Re: /dev/tcp Nuno Silva <nunojsilva@invalid.invalid> - 2026-08-20 10:10 +0100
Re: /dev/tcp Eli the Bearded <*@eli.users.panix.com> - 2026-08-20 18:15 +0000
Re: /dev/tcp Lawrence D’Oliveiro <ldo@nz.invalid> - 2026-08-20 23:30 +0000
Re: /dev/tcp Nuno Silva <nunojsilva@invalid.invalid> - 2026-08-21 01:18 +0100
Re: /dev/tcp Marc Haber <mh+usenetspam2616@zugschl.us> - 2026-08-21 09:52 +0200
Re: /dev/tcp Lawrence D’Oliveiro <ldo@nz.invalid> - 2026-08-21 08:12 +0000
Re: /dev/tcp Marc Haber <mh+usenetspam2616@zugschl.us> - 2026-08-21 11:16 +0200
Re: /dev/tcp Lawrence D’Oliveiro <ldo@nz.invalid> - 2026-08-21 22:57 +0000
Re: /dev/tcp Marc Haber <mh+usenetspam2616@zugschl.us> - 2026-08-22 06:17 +0200
Re: /dev/tcp c186282 <c186282@nnada.net> - 2026-08-21 21:50 -0400
Re: /dev/tcp Anssi Saari <anssi.saari@usenet.mail.kapsi.fi> - 2026-08-24 17:42 +0300
Re: /dev/tcp Lawrence D’Oliveiro <ldo@nz.invalid> - 2026-08-24 23:53 +0000
Re: /dev/tcp c186282 <c186282@nnada.net> - 2026-08-25 02:27 -0400
Re: /dev/tcp vallor <vallor@vallor.earth> - 2026-08-23 00:56 +0000
Re: /dev/tcp Rich <rich@example.invalid> - 2026-08-23 04:01 +0000
Re: /dev/tcp c186282 <c186282@nnada.net> - 2026-08-23 03:37 -0400
Re: /dev/tcp "Carlos E.R." <robin_listas@es.invalid> - 2026-08-23 13:50 +0200
Re: /dev/tcp vallor <vallor@vallor.earth> - 2026-08-23 22:28 +0000
Re: /dev/tcp "Carlos E.R." <robin_listas@es.invalid> - 2026-08-24 09:35 +0200
Overwriting with random data (was: Re: /dev/tcp) Nuno Silva <nunojsilva@invalid.invalid> - 2026-08-24 11:10 +0100
Re: Overwriting with random data "Carlos E.R." <robin_listas@es.invalid> - 2026-08-24 20:34 +0200
Re: Overwriting with random data Richard Kettlewell <invalid@invalid.invalid> - 2026-08-24 20:57 +0100
Re: Overwriting with random data "Carlos E.R." <robin_listas@es.invalid> - 2026-08-24 22:26 +0200
Re: Overwriting with random data c186282 <c186282@nnada.net> - 2026-08-25 02:39 -0400
Re: Overwriting with random data Richard Kettlewell <invalid@invalid.invalid> - 2026-08-25 08:45 +0100
Re: Overwriting with random data "Carlos E.R." <robin_listas@es.invalid> - 2026-08-25 11:36 +0200
Re: Overwriting with random data Richard Kettlewell <invalid@invalid.invalid> - 2026-08-25 15:19 +0100
Re: Overwriting with random data The Natural Philosopher <tnp@invalid.invalid> - 2026-08-25 12:12 +0100
Re: /dev/tcp c186282 <c186282@nnada.net> - 2026-08-25 00:37 -0400
Re: /dev/tcp c186282 <c186282@nnada.net> - 2026-08-24 00:31 -0400
Re: /dev/tcp "Carlos E.R." <robin_listas@es.invalid> - 2026-08-24 09:45 +0200
Re: /dev/tcp The Natural Philosopher <tnp@invalid.invalid> - 2026-08-23 12:52 +0100
Re: /dev/tcp The Natural Philosopher <tnp@invalid.invalid> - 2026-08-23 12:50 +0100
Re: /dev/tcp Rich <rich@example.invalid> - 2026-08-20 13:50 +0000
Re: /dev/tcp c186282 <c186282@nnada.net> - 2026-08-20 13:02 -0400
Re: /dev/tcp Rich <rich@example.invalid> - 2026-08-20 18:26 +0000
Re: /dev/tcp The Natural Philosopher <tnp@invalid.invalid> - 2026-08-21 13:54 +0100
Re: /dev/tcp c186282 <c186282@nnada.net> - 2026-08-21 22:57 -0400
Re: /dev/tcp "Carlos E.R." <robin_listas@es.invalid> - 2026-08-22 21:47 +0200
The hammer is best (Was: /dev/tcp) gazelle@shell.xmission.com (Kenny McCormack) - 2026-08-22 23:50 +0000
Re: The hammer is best (Was: /dev/tcp) c186282 <c186282@nnada.net> - 2026-08-23 04:28 -0400
Re: The hammer is best Richard Kettlewell <invalid@invalid.invalid> - 2026-08-23 10:14 +0100
Re: The hammer is best "Carlos E.R." <robin_listas@es.invalid> - 2026-08-23 13:55 +0200
Re: The hammer is best The Natural Philosopher <tnp@invalid.invalid> - 2026-08-23 13:16 +0100
Re: The hammer is best Marc Haber <mh+usenetspam2616@zugschl.us> - 2026-08-23 21:20 +0200
Re: The hammer is best c186282 <c186282@nnada.net> - 2026-08-24 02:18 -0400
Re: The hammer is best The Natural Philosopher <tnp@invalid.invalid> - 2026-08-24 11:26 +0100
Re: The hammer is best c186282 <c186282@nnada.net> - 2026-08-25 02:06 -0400
Re: The hammer is best The Natural Philosopher <tnp@invalid.invalid> - 2026-08-25 12:18 +0100
Re: The hammer is best Joed Oakes <lost@noway.home.invalid> - 2026-08-23 19:42 -0400
Re: The hammer is best Lawrence D’Oliveiro <ldo@nz.invalid> - 2026-08-23 23:56 +0000
Re: The hammer is best c186282 <c186282@nnada.net> - 2026-08-24 02:25 -0400
Re: The hammer is best rbowman <bowman@montana.com> - 2026-08-24 01:14 +0000
Re: The hammer is best "Carlos E.R." <robin_listas@es.invalid> - 2026-08-24 09:50 +0200
Re: The hammer is best c186282 <c186282@nnada.net> - 2026-08-25 00:56 -0400
Re: The hammer is best c186282 <c186282@nnada.net> - 2026-08-24 00:53 -0400
Re: The hammer is best rbowman <bowman@montana.com> - 2026-08-24 06:42 +0000
Re: The hammer is best c186282 <c186282@nnada.net> - 2026-08-24 23:34 -0400
Re: The hammer is best rbowman <bowman@montana.com> - 2026-08-25 04:08 +0000
Re: The hammer is best "Carlos E.R." <robin_listas@es.invalid> - 2026-08-25 11:29 +0200
Re: The hammer is best The Natural Philosopher <tnp@invalid.invalid> - 2026-08-24 11:28 +0100
Re: The hammer is best c186282 <c186282@nnada.net> - 2026-08-25 02:07 -0400
Re: The hammer is best rbowman <bowman@montana.com> - 2026-08-25 06:39 +0000
Re: The hammer is best The Natural Philosopher <tnp@invalid.invalid> - 2026-08-25 12:23 +0100
Re: The hammer is best Charlie Gibbs <cgibbs@kltpzyxm.invalid> - 2026-08-25 18:26 +0000
Re: The hammer is best The Natural Philosopher <tnp@invalid.invalid> - 2026-08-25 12:20 +0100
Re: The hammer is best c186282 <c186282@nnada.net> - 2026-08-23 22:16 -0400
Re: /dev/tcp Geoff Clare <geoff@clare.See-My-Signature.invalid> - 2026-08-21 13:41 +0100
Re: /dev/tcp Lawrence D’Oliveiro <ldo@nz.invalid> - 2026-08-21 22:58 +0000
Re: /dev/tcp c186282 <c186282@nnada.net> - 2026-08-21 22:28 -0400
ksh (was: /dev/tcp) Geoff Clare <geoff@clare.See-My-Signature.invalid> - 2026-08-24 13:56 +0100
Bash vs. ksh - Does it matter? And the 'vi' mode thing... (Was: ksh (was: /dev/tcp)) gazelle@shell.xmission.com (Kenny McCormack) - 2026-08-24 14:57 +0000
Re: ksh (was: /dev/tcp) Lawrence D’Oliveiro <ldo@nz.invalid> - 2026-08-24 21:08 +0000
Re: ksh (was: /dev/tcp) gazelle@shell.xmission.com (Kenny McCormack) - 2026-08-24 21:28 +0000
Re: ksh (was: /dev/tcp) rbowman <bowman@montana.com> - 2026-08-25 01:11 +0000
Re: ksh (was: /dev/tcp) Geoff Clare <geoff@clare.See-My-Signature.invalid> - 2026-08-25 13:25 +0100
Re: ksh c186282 <c186282@nnada.net> - 2026-08-25 02:25 -0400
Re: ksh rbowman <bowman@montana.com> - 2026-08-25 06:52 +0000
Re: ksh The Natural Philosopher <tnp@invalid.invalid> - 2026-08-25 12:27 +0100
Re: ksh Charlie Gibbs <cgibbs@kltpzyxm.invalid> - 2026-08-25 18:26 +0000
Re: ksh Marco Moock <mm@dorfdsl.de> - 2026-08-25 09:56 +0200
Re: ksh "Carlos E.R." <robin_listas@es.invalid> - 2026-08-25 11:24 +0200
Re: ksh Marc Haber <mh+usenetspam2616@zugschl.us> - 2026-08-25 20:36 +0200
Re: ksh The Natural Philosopher <tnp@invalid.invalid> - 2026-08-25 12:27 +0100
Re: /dev/tcp Eli the Bearded <*@eli.users.panix.com> - 2026-08-20 18:22 +0000
Re: /dev/tcp The Natural Philosopher <tnp@invalid.invalid> - 2026-08-21 13:57 +0100
Re: /dev/tcp Lars Poulsen <lars@beagle-ears.com> - 2026-08-23 06:37 -0700
Re: /dev/tcp Richard Kettlewell <invalid@invalid.invalid> - 2026-08-23 14:49 +0100
Re: /dev/tcp The Natural Philosopher <tnp@invalid.invalid> - 2026-08-23 16:13 +0100
Re: /dev/tcp Lawrence D’Oliveiro <ldo@nz.invalid> - 2026-08-23 22:31 +0000
Re: /dev/tcp Richard Kettlewell <invalid@invalid.invalid> - 2026-08-24 19:08 +0100
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