Oh sorry - I misunderstood then.
Currently I have to solutions, both of which are acceptable, though not completly what I want.
One of them is to use logplot instead of plot - that is indeed working, though it is not as cusomizable the ideal solution.
The second is a small shellscript I've made, to run the commands in the gui (though the .mapleinit file), and then kill maple after it is done processesing.
That problem is, that I - as he also assumed - that I want to export the graph to a postscript file (or any other image format for that matter), without user interaction.
The logplot command is indeed working, though it still cannot print out colored graph - but I'll live without it. ;)
EDIT: Sorry, I fixed that myself - it just required me to use the cps instead of the ps driver.
Also, it is not just a bug in the plotps driver, as the axis=[mode=log] option is not working with the ascii-driver either - I do not think it is working with any commandline driver.