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Re: How to run automatically a script as soon root login

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  Re: How to run automatically a script as soon root login Will Mengarini <seldon@eskimo.com> - 2024-05-13 18:50 +0200
    Re: How to run automatically a script as soon root login Mario Marietto <marietto2008@gmail.com> - 2024-05-14 08:20 +0200
      Re: How to run automatically a script as soon root login <tomas@tuxteam.de> - 2024-05-14 08:50 +0200
      Re: How to run automatically a script as soon root login Greg Wooledge <greg@wooledge.org> - 2024-05-14 13:10 +0200
        Re: How to run automatically a script as soon root login Greg Wooledge <greg@wooledge.org> - 2024-05-14 13:20 +0200
          Re: How to run automatically a script as soon root login Mario Marietto <marietto2008@gmail.com> - 2024-05-14 15:00 +0200
            Re: How to run automatically a script as soon root login Greg Wooledge <greg@wooledge.org> - 2024-05-14 17:00 +0200
        Re: How to run automatically a script as soon root login Mario Marietto <marietto2008@gmail.com> - 2024-05-14 13:20 +0200

#269299 — Re: How to run automatically a script as soon root login

Nobody has yet applauded this glorious implementation
of the 1960s GOTO statement in *Bash*?!

* Mario Marietto <marietto2008@gmail.com> [24-05/13=Mo 13:37 +0200]:
> function jumpto
> {
>         label=$1
>         cmd=$(sed -n "/$label:/{:a;n;p;ba};" $0 | grep -v ':$')
>         eval "$cmd"
>         exit
> }

Anyway, Marietto, you've got two typi:

> mid :
That should be "mid:".

> jump foo
That should be "jumpto foo".

Once you've got your root-login script working, I hope you
move on to implementing a complete open-source PL/I compiler.

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#269318

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Nobody can show a different way,a modern way, for creating my script ? Why
did I feel so comfortable by recreating the 1960s GOTO statement in Bash ?

On Mon, May 13, 2024 at 6:30 PM Will Mengarini <seldon@eskimo.com> wrote:

> Nobody has yet applauded this glorious implementation
> of the 1960s GOTO statement in *Bash*?!
>
> * Mario Marietto <marietto2008@gmail.com> [24-05/13=Mo 13:37 +0200]:
> > function jumpto
> > {
> >         label=$1
> >         cmd=$(sed -n "/$label:/{:a;n;p;ba};" $0 | grep -v ':$')
> >         eval "$cmd"
> >         exit
> > }
>
> Anyway, Marietto, you've got two typi:
>
> > mid :
> That should be "mid:".
>
> > jump foo
> That should be "jumpto foo".
>
> Once you've got your root-login script working, I hope you
> move on to implementing a complete open-source PL/I compiler.
>


-- 
Mario.

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#269319

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On Tue, May 14, 2024 at 08:09:18AM +0200, Mario Marietto wrote:
> Nobody can show a different way,a modern way, for creating my script ? Why
> did I feel so comfortable by recreating the 1960s GOTO statement in Bash ?

I think your style is too alien to most of the people here to
make them feel their time is worth trying to wrap their heads
around it (I just got a rough feeling on how it works, asked
myself "Why?" and went on).

You'll have to go it alone if you chose such an idiosyncratic
style, it seems.

Cheers
-- 
t

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#269322

On Tue, May 14, 2024 at 08:09:18AM +0200, Mario Marietto wrote:
> Nobody can show a different way,a modern way, for creating my script ? Why
> did I feel so comfortable by recreating the 1960s GOTO statement in Bash ?

I have absolutely no clue what you're trying to do or why you're trying
to do it, but I *promise* you, whatever you think you're doing, you
have NOT recreated a GOTO statement in bash.

You showed a function.  Functions can be called.  This is NOT the same
as issuing a GOTO command, because once the function returns, control
flow resumes from the point where it was called.

Bash (and sh, on which bash is based) explicitly chose not to have a GOTO
statement in its language.  The authors chose instead to use the control
primitives that are collectively known as "structured programming"
(if, while, for, functions).

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#269323

On Tue, May 14, 2024 at 01:10:05PM +0200, Mario Marietto wrote:
> Your answer does not help me to understand how to use a "structured
> programming / if , while, for, functions" for the specific task that I want
> to achieve.

What task is that?

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#269337

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I've installed the Cloudflare gateway on Debian as a vm because I can't do
it directly in FreeBSD. But I want to be covered even when I use FreeBSD.
The script that I wrote forward the Cloudflare "VPN" from Debian to
FreeBSD,so from outside my IP will be cloudFlared.

On Tue, May 14, 2024 at 1:16 PM Greg Wooledge <greg@wooledge.org> wrote:

> On Tue, May 14, 2024 at 01:10:05PM +0200, Mario Marietto wrote:
> > Your answer does not help me to understand how to use a "structured
> > programming / if , while, for, functions" for the specific task that I
> want
> > to achieve.
>
> What task is that?
>
>

-- 
Mario.

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#269343

On Tue, May 14, 2024 at 02:51:17PM +0200, Mario Marietto wrote:
> I've installed the Cloudflare gateway on Debian as a vm because I can't do
> it directly in FreeBSD. But I want to be covered even when I use FreeBSD.
> The script that I wrote forward the Cloudflare "VPN" from Debian to
> FreeBSD,so from outside my IP will be cloudFlared.

Disclaimer: I know nothing about Cloudflare.

So you wrote a bash script.  I will assume this script does what you
want it to.  You type its name to run it, or you have it set up to run
at boot time, or you have it set up to run at login time, or via a
cron job, or via a DHCP dhclient enter/exit hook....

Where does the GOTO come in?  Do you think your script does something
internally which mimics a GOTO in some way?  Or that it *should* do that?

Why would you need a GOTO to do whatever networking configuration steps
the script does?  Lacking any knowledge of Cloudflare, I'm imagining
that the script simply performs a sequence of commands, in a linear order,
without any branching or looping or jumping around.

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#269326

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Your answer does not help me to understand how to use a "structured
programming / if , while, for, functions" for the specific task that I want
to achieve. I failed using "your" lovely structured programming and that's
the reason why I'm asking for some hint to understand why and how I can use
it. Your answer puts the finger on the spot and isn't helpful, also because
it says things that I already knew.


On Tue, May 14, 2024 at 1:03 PM Greg Wooledge <greg@wooledge.org> wrote:

> On Tue, May 14, 2024 at 08:09:18AM +0200, Mario Marietto wrote:
> > Nobody can show a different way,a modern way, for creating my script ?
> Why
> > did I feel so comfortable by recreating the 1960s GOTO statement in Bash
> ?
>
> I have absolutely no clue what you're trying to do or why you're trying
> to do it, but I *promise* you, whatever you think you're doing, you
> have NOT recreated a GOTO statement in bash.
>
> You showed a function.  Functions can be called.  This is NOT the same
> as issuing a GOTO command, because once the function returns, control
> flow resumes from the point where it was called.
>
> Bash (and sh, on which bash is based) explicitly chose not to have a GOTO
> statement in its language.  The authors chose instead to use the control
> primitives that are collectively known as "structured programming"
> (if, while, for, functions).
>
>

-- 
Mario.

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