printing multipage postscript files

[Petr Mikulik]

In Octave 2.x, printing many drawings into one multipage postscript file 
was very easy:
	gset term post; gset out 'a.ps'
	plot(1:10)
	plot(2:20) # many plots from simulations, one plot per page
	gset out; gset term x11

(Note that multipage pdf files or animated gifs were also possible using  
gset term pdf or gset term gif animate.)

In Matlab, it is achieved in a more complicated way which requires "print" 
command after each plot:
	plot(1:10)
	print a.ps -dps
	plot(2:20)
	print a.ps -dps -dappend

which actually needs to be written in this way if the same script generates 
graphs for screen and/or printer:
	print=1;
        plot(1:10)
        if (print) print a.ps -dps; endif
        plot(2:20)
        if (print) print a.ps -dps -dappend; endif

How to achieve this in Octave 3.x where gset is no longer possible?
Gnuplot does not support concatenation of output into one file.

It seems to me that the "-dappend" option could be easily implemented in 
Octave this way (requires ghostcript and creation of two temporary files):
    print a.ps -dps -dappend
=>
    drawnow('/tmp/tmp1.ps')
    gs -dNOPAUSE -sDEVICE=pswrite -sOutputFile=/tmp/tmp2.ps \
	 a.ps tmp1.ps -c quit
    mv /tmp/tmp2.ps a.ps

If ghostscript is not found, then the last plot will overwrite the file, 
i.e.
   mv /tmp/tmp1.ps a.ps

On unixes, ghostscript is always called "gs", thus there will be no problem. 
On Windows, these names can be rather different ("gswinc"?).
On Mac?

Could the "-dappend" functionality by added?

---
Petr Mikulik