Hi again!, I just discover that the problem was on my hard drive!. Because of some other problem I did a disk checking and found several invalid nodes, among them, the one that had /usr/bin/which. I clear the nodes, reinstall that file, and the problem I reported before is gone:)
Thanks... Patricio -- ---------------------------------------------------------------- . . /. . * /`'\ . Patricio Rojo . / ./ \.. 516 Space Sciences Building ../ .' \. Cornell University ../ / ../ \ Ithaca, NY 14853 ./ ./ ./ \ (607)255-6438 ./ ./ \ \. [EMAIL PROTECTED] ---------------------------------------------------------------- http://www.gnu.org/philosophy/no-word-attachments.html