Thank you, JacquesC and acer.:) I want to execute: system("maple myMapleProgram.mw 1.dat"); system("maple myMapleProgram.mw 2.dat"); system("maple myMapleProgram.mw 3.dat"); ... in a perl program. I hope myMapleProgram.mw can get *.dat and then open the file and read data from *.dat, like: restart: ... datafile:=argv[1]; #Pseudo code here fd:=fopen(datafile, READ,TEXT); ... I don't know how to do it. Can you help me? Thank you very much.