Re: fileexist(f)

[Petr M. <mi...@ph...>]

> Can we discuss this some more first?
> Or at least let me try out the patch first?
> I'm not 100% convinced it will always work, even on linux.

It is enclosed, please try it. I think it must work everywhere where fopen() 
is implemented. (And gnuplot without fopen() cannot live.)

>>>> Actually, what some users ask for real-time plotting, is something
>>>> like
>>>>    pause untilfileexist "next.dat"
>>>>    pause untilfilechanged "next.dat"
>
> It seems to me easier to use  system("find . -name <foo> -newer <bar>")

This is not portable either.

Actually, the most trivial solution seems to be:

prev=`ls -l bla.dat`   	or  prev=`dir bla.dat` 
if (!variable_exist(new)) new=prev  # 1st time here ??????????????
if (pi > 3.0) pi=0; new=prev        # 1st time here ??????????????
if (new == prev) pause 5; reread

plot 'bla.dat'
new = prev
reread


??? how to detect that a variable has not been initialized?

---
PM