With many thanks to Peter, Jerry, and Dave for sharing their insights. At least in RedHat Linux 7.2, csh in not a symbolic link to tcsh. tcsh is located in /usr/local/bin (/com/sol2/bin) while csh is in /bin. I have decided to use tcsh now and look into zsh later. And by the way, was is the advantage of using bash then? Cheers, >>Ali