Ferret how-to: batch graphics

[hankin@xxxxxxxxxxxxxxxxxxx (Steve Hankin)]

	Ferret how-to: Persistent screen graphics in batch mode

Ferret graphics which are generated in batch mode immediately dissappear from
the screen. The write-up below explains a technique to make the graphics
persist.

(There is an FAQ writeup describing how to run Ferret in batch mode at
http://tmap.pmel.noaa.gov/ferret/FAQ/system/batch_mode_usage.html however it
does not address this question).

	Happy Ferreting - steve

==============================================================

--- Forwarded mail from hankin@rogue.pmel.noaa.gov (Steve Hankin)

To: Kim Rudeen <rudeen@caesun16.msd.ray.com>

On Mar 28,  8:48am, Kim Rudeen wrote:
> Subject: FERRET Go Scripts
> Steve:
>
> One of our potential FERRET users has sent me a question:
>
> >       How do you execute a particular go script from the
> >       unix command line? Not within the ferret command
> >       line, but the unix prompt.
>
> That is, he would like to hand FERRET a particular go script
> to execute, possibly by using a shell command such as
>
> 	% ferret ferret_script.jnl
>
> To be precise, he wants to
>
> >	fire off my ferret go script from my gui. I don't want the
> >	user to have to worry about knowing which one of the many
> >	go scripts to execute.
>
> I have tried loading commands into a file, and then executing
> FERRET using redirection:
>
>         % ferret < ferret_commands
>
> When I do this, FERRET executes all the commands in the file,
> generates any displays, and then immediately terminates, and
> all displays go bye-bye.  Is there a way to get FERRET to
> leave the displays up and wait for additional commands?
>
> Are there any other ways to run FERRET with a specific set
> of commands?
>
> Thanks,
> Kim Rudeen
>-- End of excerpt from Kim Rudeen

Hi Kim,

This can be done best with named pipes.

! just once do this (create the named pipe in your filesystem)
	mknod ferret_commands p

! to start ferret
	cat >> ferret_commands &
	ferret < ferret_commands&

! to execute a script
	cat my_script.jnl >> ferret_commands


	- steve



--

		|  NOAA/PMEL               |  ph. (206) 526-6080
Steve Hankin	|  7600 Sand Point Way NE  |  FAX (206) 526-6744
		|  Seattle, WA 98115-0070  |  hankin@pmel.noaa.gov


--- End of forwarded mail from hankin@rogue.pmel.noaa.gov (Steve Hankin)


-- 

		|  NOAA/PMEL               |  ph. (206) 526-6080  
Steve Hankin	|  7600 Sand Point Way NE  |  FAX (206) 526-6744
		|  Seattle, WA 98115-0070  |  hankin@pmel.noaa.gov