Hello,
for school i have to write a makefile in unix which have to do the following:
-convert all .jpeg files to .png files
-with "all" its ment all in the same folder of the make file
-iam not allowed to use the "convert" command
-no loops allowed like "for" or something (hope i named that right..)
iam still a newb at unix and iam allready freakin out 
so far i know that i have to use jpegtopng command but i dont know how to do it that the names of the output files are exactly as the input names. and i also dont know how to do it for all files in the same directory/folder where the make file is...
i realy hope anyone of u can help me out with this :S
Greetings, Deadwalk
PS: Sorry for that horrible english but that all ive got 