Hi, I'm a new using mac and think to have done a big mess. I was trying to install gnuplot and I would like to run it directly from the shell, like in a unix system. I read in some forums that I had to modify the path...actually i don't really know what I'm talking about, I just thought I had to tell the shell where to go and search gnu plot, nothing more. Anyway I wrote on the shell echo export PATH=".:$/Applications/Gnuplot.app/Contents/Resources/bin/gnuplot:/usr/local/bin" > .profile modifying the hidden file .profile. The problem I have now is 1) I can't use anymore the the basic command in the shell, such as cat, top, rm for example. 2) obvioulsy I didn't solve the problem with gnuplot and I still have to run it in a separate shell. Can you help me please to fix these problems? thank you.