gnuplot-info

[Gnuplot-info] use filename in the batch file

[Markus F. <fel...@gm...>]

Hey,

I wanna to execute my batch file,
gnuplot filename.batch

In my batch file i wanna use the filename.
How to do this?
I am using Gnuplot under Debian.
For example in bash scripts its the same as you would use the $0 .

mfg Markus

Re: [Gnuplot-info] use filename in the batch file

[<br...@ph...>]

Markus Feldmann wrote:

> I wanna to execute my batch file,
> gnuplot filename.batch

> In my batch file i wanna use the filename.

Which file name?  And what for?

[Gnuplot-info] Re: use filename in the batch file

[Markus F. <fel...@gm...>]

Hans-Bernhard Bröker wrote:
> Markus Feldmann wrote:
> 
>> I wanna to execute my batch file,
>> gnuplot filename.batch
> 
>> In my batch file i wanna use the filename.
> 
> Which file name?  And what for?
> 

The filename of my batch file may be for example "aufg11.batch".

In this batch file i wanna use a file which has got values.
The name of this file is "aufg11.dat".

I don't want to,
plot "aufg11.dat" ...
but i want to,
plot "$filename"
or something like this.
This is an wrong example, and i think this doesn't work under gnuplot.
But thats my Question.
How can i can use such a substitution?

mfg Markus

Re: [Gnuplot-info] Re: use filename in the batch file

[<br...@ph...>]

Markus Feldmann wrote:

[...]
> The filename of my batch file may be for example "aufg11.batch".
> 
> In this batch file i wanna use a file which has got values.
> The name of this file is "aufg11.dat".
> 
> I don't want to,
> plot "aufg11.dat" ...
> but i want to,
> plot "$filename"
> or something like this.

Sorry, no can do.  Not with a filename that was used to run gnuplot on, 
like that, anyway.  You can refer to environment variables, though, if 
your platform is sufficiently Unix-like to support command substitution:

	plot "`echo $FILE`.dat"

Or even move the entire scripting job off gnuplot's shoulders onto that 
of the shell, by using a "HERE" script:

	gnuplot -persist <<\EOF
	  plot "$1.dat"
	EOF


or the somewhat simpler

	echo plot "$1.dat" | gnuplot -persist

Re: [Gnuplot-info] Re: use filename in the batch file

[Dave D. <dde...@es...>]

Hans-Bernhard Br=F6ker <br...@ph...> writes:

> Markus Feldmann wrote:
>
> [...]
>> The filename of my batch file may be for example "aufg11.batch".
>> In this batch file i wanna use a file which has got values.
>> The name of this file is "aufg11.dat".
>> I don't want to,
>> plot "aufg11.dat" ...
>> but i want to,
>> plot "$filename"
>> or something like this.
>
> Sorry, no can do.  Not with a filename that was used to run gnuplot
> on, like that, anyway.  You can refer to environment variables,
> though, if your platform is sufficiently Unix-like ...
>

I think he said it was debian.

I was pondering over somehow figuring it out from /proc/self but I've
not really come with anything. Unfortunately, if you invoke a subshell
to do any parsing, it will have a different /proc/self - I wonder if
the linux people have considered adding a /proc/pid/ppid soft-link to
the /proc entry of the parent ?

Best I came up with was

gnuplot < batchfile

then a subshell would inherit stdin, and could get the filename from
its own /proc/self/fd/0


> 	plot "`echo $FILE`.dat"
>
> Or even move the entire scripting job off gnuplot's shoulders onto
> that of the shell, by using a "HERE" script:
>
> 	gnuplot -persist <<\EOF
> 	  plot "$1.dat"
> 	EOF
>
>
> or the somewhat simpler
>
> 	echo plot "$1.dat" | gnuplot -persist
>

Or perhaps a wrapper script which derives the filename from $1, stuffs
it into an env. variable (or opens a fixed fd for it) and execs the
real gnuplot ?

$ gnuplot-wrapper batchfile

where gnuplot-wrapper is a shell-script with

export DATAFILE=3D${1/batch/dat}
exec gnuplot $*

and the script can access $DATAFILE

or perhaps

exec gnuplot $* 20< ${1/batch/dat}

and then the script can access the datafile as /proc/self/fd/20


dd
--=20
Dave Denholm              <dde...@es...>       http://www.esmertec=
.com

Re: [Gnuplot-info] Re: use filename in the batch file

[<br...@ph...>]

Dave Denholm wrote:

> I was pondering over somehow figuring it out from /proc/self but I've
> not really come with anything. Unfortunately, if you invoke a subshell
> to do any parsing, it will have a different /proc/self - I wonder if
> the linux people have considered adding a /proc/pid/ppid soft-link to
> the /proc entry of the parent ?

That wouldn't help much, I think.  He's trying to access the name of the 
script file currently being executed.  That can be literally anywhere in 
the command line --- I don't see how anyhing in /proc could help finding 
that, expecially in cases like

	gnuplot -noraise -persist -mono foo.gpl  bar.gpl baz.gpl

How is 'bar.gpl' supposed to find its own name in this?

If this is to work, it has to be done from inside gnuplot.  I.e. 
there'll have to be a GPVAL_ that exports save_name from inside 
load_command() to the user.

> Or perhaps a wrapper script which derives the filename from $1, stuffs
> it into an env. variable (or opens a fixed fd for it) and execs the
> real gnuplot ?

Once you start writing scripts to run from outside gnuplot, I don't 
think there's much point actually looking at the filename of that script 
any more, because there no more any reason to establish a link between 
the name passed to gnuplot (which is, by definition, a script filename) 
and that of the datafile to be plotted.

What's really missing here is not some shell voodoo, but a way of 
setting gnuplot user-defined variables by startup options, i.e. 
something like

	gnuplot -DNAME="foo.dat" foo.gpl

If you're going to do that via a wrapper script, you might as well use 
an existing one, like http://www.phys.uni-paderborn.de/~stern/pl/ (also 
linked from our homepage).