UNIX Problem with method Runtime exec(String[],String[],File)

Hello !!
i'm french
scuse my english
I got a probleme with method exec(String[],String[],File) of Runtime Class
i don't have any probleme when my program runs on Windows NT but the same program on UNIX doesnt execute my command..
When i use exec(String[]) methode i dont have this problem ...but i need the second one methode because i have to execute my command in a different directory than the JAVA program.
I need that results of this command are placed in this drectory so that i can't use an exex() like that :
exemple with a perl :
"perl /toto/titi/hello.pl"
I want to execute this :
"perl hello.pl" (and hello.pl is placed in /toto/titi)
Conclusion :
the exec(String[],String[],File) solution is ok with NT ...
but with UNIX ????
Is there other solution ??
Should i do a "cd" command before my execution ? how can i do this ??
Thanks !!!!

Could you post your source code (only relevant part)
Raghu

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